Add CHANGELOG.md.

Author: Robert Jackson

CHANGELOG.md

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+## v0.2.10 (2019-02-15)
+
+#### :rocket: Enhancement
+* [#57](https://github.com/rwjblue/codemod-cli/pull/57) Update dependencies to latest versions. ([@rwjblue](https://github.com/rwjblue))
+
+#### :bug: Bug Fix
+* [#56](https://github.com/rwjblue/codemod-cli/pull/56) Do not assume transform files are `.js` ([@eventualbuddha](https://github.com/eventualbuddha))
+
+#### Committers: 2
+- Brian Donovan ([@eventualbuddha](https://github.com/eventualbuddha))
+- Robert Jackson ([@rwjblue](https://github.com/rwjblue))
+