Add a CHANGELOG file with release notes.

CHANGELOG.md

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+# CHANGELOG
+
+[sscaffold-css](https://sscaffold-css.com/) does its best to follow [semantic versioning](https://semver.org/):
+
+* MAJOR releases may break layouts using previous versions and should be thoroughly tested;
+* MINOR releases make an effort to not break layouts using previous versions but may contain bugfixes that could change some aspects of the layout;
+* PATCH releases include only small, simple bug fixes and should be compatible with all previous versions of the same MAJOR release.
+
+PATCH releases will be backported to previous MAJOR releases when applicable and I'm in the mood for it.
+
+## RELEASES
+
+### 0.1.1
+March 8, 2020
+
+* Fix missing `and` from `@media` queries (https://github.com/robsheldon/sscaffold-css/issues/10)
+* Fix `svg+xml` values mangled by a naughty CSS minifier; trying a different minifier (https://github.com/robsheldon/sscaffold-css/issues/9)
+
+
+### 0.1.0
+January 15, 2020
+
+* Initial release following limited pre-release testing.