Add CHANGELOG

CHANGELOG.md

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+## 15.5.8
+
+* Limit the manual PropTypes call warning count because it has false positives with React versions earlier than 15.2.0 in the 15.x branch and 0.14.9 in the 0.14.x branch. ([@gaearon](https://github.com/gaearon) in [#26](https://github.com/reactjs/prop-types/pull/26))
+
+## 15.5.7
+
+* **Critical Bugfix:** Fix an accidental breaking change that caused errors in production when used through `React.PropTypes`.  ([@gaearon](https://github.com/gaearon) in [#20](https://github.com/reactjs/prop-types/pull/20))
+* Improve the size of production UMD build.  ([@aweary](https://github.com/aweary) in [38ba18](https://github.com/reactjs/prop-types/commit/38ba18a4a8f705f4b2b33c88204573ddd604f2d6) and [7882a7](https://github.com/reactjs/prop-types/commit/7882a7285293db5f284bcf559b869fd2cd4c44d4))
+
+## 15.5.6
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* Fix a markdown issue in README. ([@bvaughn](https://github.com/bvaughn) in [174f77](https://github.com/reactjs/prop-types/commit/174f77a50484fa628593e84b871fb40eed78b69a))
+
+## 15.5.5
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* Add missing documentation and license files.  ([@bvaughn](https://github.com/bvaughn) in [0a53d3](https://github.com/reactjs/prop-types/commit/0a53d3a34283ae1e2d3aa396632b6dc2a2061e6a))
+
+## 15.5.4
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* Reduce the size of the UMD Build. ([@acdlite](https://github.com/acdlite) in [31e9344](https://github.com/reactjs/prop-types/commit/31e9344ca3233159928da66295da17dad82db1a8))
+* Remove bad package url. ([@ljharb](https://github.com/ljharb) in [158198f](https://github.com/reactjs/prop-types/commit/158198fd6c468a3f6f742e0e355e622b3914048a))
+* Remove the accidentally included typechecking code from the production build.
+
+## 15.5.3
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* Remove the accidentally included React package code from the UMD bundle. ([@acdlite](https://github.com/acdlite) in [df318bb](https://github.com/reactjs/prop-types/commit/df318bba8a89bc5aadbb0292822cf4ed71d27ace))
+
+## 15.5.2
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* Remove dependency on React for CommonJS entry point. ([@acdlite](https://github.com/acdlite) in [cae72bb](https://github.com/reactjs/prop-types/commit/cae72bb281a3766c765e3624f6088c3713567e6d))
+
+
+## 15.5.1
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* Remove accidental uncompiled ES6 syntax in the published package. ([@acdlite](https://github.com/acdlite) in [e191963](https://github.com/facebook/react/commit/e1919638b39dd65eedd250a8bb649773ca61b6f1))
+
+## 15.5.0
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* Initial release.
+
+## Before 15.5.0
+
+PropTypes was previously included in React, but is now a separate package. For earlier history of PropTypes [see the React change log.](https://github.com/facebook/react/blob/master/CHANGELOG.md)