create release changelog entry

CHANGELOG.md

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+# Changelog
+
+## v0.12.0
+
+- [email protected]
+- [email protected]
+- Update command-line-* suite of dependency, refactor to accomodate
+- Refactor init command to be more easily testable, reduce startup times
+- Catch exception thrown by findup when finding gulpfiles
+- Add input linting argument, and fix major bug with paths
+- init: Don’t crash when a package.json is present with no name
+- Speed up start time, move last of the commands to load their dependencies at runtime
+- Add demo and description for element template (#229)
+- specify the sync interface when searching templates for package.json
+- Removes unneccesary liftoff dependency
+- Add update-notify to notify users when their cli is out of date
+- Add tests for init command