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Fix locale tests for the stricter `parse` (date-fns#823)

In `parse`, return Invalid Date if there is any remaining non-whitesp…

…ace input (date-fns#821)

Rebuild index.js

Add missing CHANGELOG.md entries of v2.0.0-alpha.13

Add missing CHANGELOG entries

Remove zh-CN and fr from the list of outdated locales

Add an isDate test for Invalid Date

Rebuild locale indices

Add recent bugfixes to CHANGELOG.md