#### Is this adding or improving a _feature_ or fixing a _bug_?
This should fix `Unable to get property 'childNodes' of undefined or null reference` error in IE11 when using slate-html-serializer and deserializing an empty string (#1757, #1756).
#### What's the new behavior?
The `defaultParseHtml` now returns an empty body element if the parsed body is null.
I tested this in the latest Chrome, Firefox and Safari, and they all seemed to work similarly. If the html param was an empty string, `parseFromString` returned a document element, which had a body property which was an empty body element. In IE11 though the body property was null, which caused the undefined or null reference later.
#### Have you checked that...?
* [x] The new code matches the existing patterns and styles.
* [x] The tests pass with `yarn test`.
* [x] The linter passes with `yarn lint`. (Fix errors with `yarn prettier`.)
* [x] The relevant examples still work. (Run examples with `yarn watch`.)
* Trying to use memoization and upgrade to react v16
* Fix error
* Fix error
* Fix handlers error
* Add annotation
* Remove EventHandlers
* No state
* Remove un-necessary polyfill
* Remove un-necessary polyfill
* Remove un-necessary handlers settings
* Early Return
* Fix Early Return
* Fix onChange
* Do not run onChange stack twice on same change
* Update annotation
* Better sense of resolve++
* Cache value in onChange and didMount
* Remove un-necessary rechack
* Renaming
* Remove change in leaf.js
* Handlers as this.handlers
* do not re-initialize change in onChange
* Re-run onChange stack only when change happens
* Update value when stack changes
* Rename to memoize-one
* queue changes
* Unify interface
* Fix bug
* Add document
* Remove id
* Do not use map
* Fix bug
* Fix eslint
* Fix update when props.value changes
* Add annotation
* Fix stack
* Inline queueChange
* Restore onChange
* restore onChange
* Refactor change and onChange
* Use onChange as the single interface for update
* Do not flushChange if inside event
* Give a warning about synchronous editor.change call
* Change isInChange in editor.change
* refactor resolution and tmp logic, cleanup code
#### Is this adding or improving a _feature_ or fixing a _bug_?
Debt.
#### What's the new behavior?
`createHyperscript` takes an options object that now looks for the `decorations` property instead of the `decorators` property
#### How does this change work?
Pretty straightforward rename of an option, then all of its uses and wherever the term decorators showed up in docs
#### Have you checked that...?
* [x] The new code matches the existing patterns and styles.
* [x] The tests pass with `yarn test`.
* [x] The linter passes with `yarn lint`. (Fix errors with `yarn prettier`.)
* [x] The relevant examples still work. (Run examples with `yarn watch`.)
#### Does this fix any issues or need any specific reviewers?
Fixes: #1996
Reviewers: @ianstormtaylor
#### Is this adding or improving a _feature_ or fixing a _bug_?
Bug.
#### What's the new behavior?
All normalizing change methods should use `normalize: false` otherwise the normalization can recurse and cause strange errors.
#### Have you checked that...?
<!--
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* [x] The new code matches the existing patterns and styles.
* [x] The tests pass with `yarn test`.
* [x] The linter passes with `yarn lint`. (Fix errors with `yarn prettier`.)
* [x] The relevant examples still work. (Run examples with `yarn watch`.)
* Adds Unicode LF character to line endings for clipboard plaintext
This addresses https://github.com/ianstormtaylor/slate/issues/1932
* Fixes plaintext/unicode pastes not having line breaks
* Removes stray spaces for Prettier
* Refactors Value creation to save 4 lines
* Allows for Ctrl+Backspace on line start
Previously Ctrl+Backspace would do nothing instead of continuing on to the above block.
* Tests that deleteWordBackwards joins lines properly
* Adds Unicode LF character to line endings for clipboard plaintext
This addresses https://github.com/ianstormtaylor/slate/issues/1932
* Fixes plaintext/unicode pastes not having line breaks
* Removes stray spaces for Prettier
* Refactors Value creation to save 4 lines
* Run mocha test with module alias
* Running test with babel module alias
* Fix model alias
* Fix model alias
* Resolve module alias
* Running test with babel module alias
* Connect to codecov
* add codecov to travis
* stop if yarn test has errors
* Still cannot collect data from slate modules
* Try to check whether it works with codecov
* Move config to nycrc
* Remove nyc require
* Update nyc to use src
* better before_script
#### Is this adding or improving a _feature_ or fixing a _bug_?
Improvement.
#### What's the new behavior?
Adds a `Node.createRange` method for more easily creating ranges that are normalized to the current document. As well as a `Node.resolveRange` lower-level method for just doing the normalization on an existing range.
Later we can deprecate `Range.normalize` since it should be on the node instead.
#### Have you checked that...?
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* [x] The new code matches the existing patterns and styles.
* [x] The tests pass with `yarn test`.
* [x] The linter passes with `yarn lint`. (Fix errors with `yarn prettier`.)
* [x] The relevant examples still work. (Run examples with `yarn watch`.)
#### Does this fix any issues or need any specific reviewers?
Fixes: #2011
#### Is this adding or improving a _feature_ or fixing a _bug_?
Bug.
#### What's the new behavior?
Fixes selection operations from being duplicated.
#### How does this change work?
Previously the selection properties were compared by reference, but paths are immutable `List` objects, which always show up as having changed, resulting in extra selection operations that without any real changes. We now use `Immutable.is` to remove those duplicates, fixing the undo history stack.
#### Have you checked that...?
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* [x] The new code matches the existing patterns and styles.
* [x] The tests pass with `yarn test`.
* [x] The linter passes with `yarn lint`. (Fix errors with `yarn prettier`.)
* [x] The relevant examples still work. (Run examples with `yarn watch`.)
#### Does this fix any issues or need any specific reviewers?
Fixes: #2006
#### Is this adding or improving a _feature_ or fixing a _bug_?
Bug.
#### What's the new behavior?
Fixes `Node.getFragmentAtRange` to use the proper argument signature when calling `Node.splitNode`, and refactors it to use paths for all of its logic.
#### Have you checked that...?
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* [x] The new code matches the existing patterns and styles.
* [x] The tests pass with `yarn test`.
* [x] The linter passes with `yarn lint`. (Fix errors with `yarn prettier`.)
* [x] The relevant examples still work. (Run examples with `yarn watch`.)
#### Does this fix any issues or need any specific reviewers?
Fixes: #2009
