add CHANGELOG

Author: nkubala

CHANGELOG.md

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+# container-diff Release Notes
+
+# Version 0.5.0 - 10/9/17
+* Apt diffing now done by default
+* Add support for building single platform with Bazel
+* Move util methods to new `pkgutil` package for vendoring
+* Add support for specifying local vs remote images with `daemon://` and `remote://` prefixes
+* Remove Docker dependency for local images
+
+
+# Version 0.4.1
+* Fixed error with running container-diff with no analyzer specified
+* Fixed error where container-diff version was outputting an incorrect value
+
+# Version 0.4.0
+* Added single image analysis #20 
+* Added file/package output sorting by size #36
+* Changed CLI to use "--types" flag #68 
+* Various cleaning and refactoring