update issue template and contributing docs

.github/ISSUE_TEMPLATE.md

@@ -2,7 +2,7 @@
 #### Do you want to request a *feature* or report a *bug*?
 
 <!-- 
-If you have a question, you might ask it in our Slack channel instead.
+If you have a question, ask it in our Slack channel instead:
 
 https://slate-slack.herokuapp.com/
 -->
@@ -10,11 +10,15 @@ https://slate-slack.herokuapp.com/
 #### What's the current behavior?
 
 <!-- 
-For bugs, please create a JSFiddle that reproduces the issue using 
-our template, and include a GIF showing how to easily reproduce it.
+For bugs, please include the following: 
 
-And for bugs please include your OS, browser, Slate version and any
-other bit of info that may track down why it's happening.
+  - A JSFiddle that reproduces the issue.
+  - A GIF showing how to easily reproduce it.
+  - Information about your OS, browser, Slate version, etc.
+
+If you don't include these helpful things, there's a very good chance your issue won't get addressed, or will be closed when we do spring cleaning. 
+
+We need to keep the issues actionable, or else maintaining Slate becomes overwhelming. Thank you for understanding!
 
 https://jsfiddle.net/2zokvrvt/7/
 http://recordit.co/
@@ -23,7 +27,11 @@ http://recordit.co/
 #### What's the expected behavior?
 
 <!-- 
-Researching how other editors handle this issue is super helpful!
+The fastest, and most appreciated way to have your issue fixed is to create a pull request with working, tested code and we will help get it merged. Don't be scared to open a pull request that isn't completed and ask for input. We're happy to give direction!
+
+Slate is solving a pretty complex problem, and we can't do it without active contributors. Thank you so much for your help!
+
+Also, researching how other editors handle this issue is super helpful!
 
 https://draftjs.org/
 http://prosemirror.net/