Further corrections to CHANGELOG

**what is the change?:**
- Add deprecation warning to all versions pre 15.5.7.
- Move 'React package inclusion fix' annotation from 15.5.3 to 15.5.2
- Improved wording of 'Reduce size of UMD build' in 15.5.4
- Add note about 'Remove the accidentally included typechecking code...'
  in 15.5.4 (what commit did this?)
- Move 'Remove accidental uncompiled ES6' annotation to 15.5.1
- That leaves no changes under 15.5.3; maybe we released this in an
  effort to keep this in sync with the main React package?

Follow up commit adds annotations for 15.5.4-15.5.8.

**why make this change?:**
To be more accurate.

**test plan:**
Visual inspection.

**issue:**
facebook/react#9443

CHANGELOG.md

@@ -1,13 +1,29 @@
 ## 15.5.4
-* Fix UMD Build. ([@acdlite](https://github.com/acdlite) in [31e9344](https://github.com/reactjs/prop-types/commit/31e9344ca3233159928da66295da17dad82db1a8))
+
+**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
-* Remove the dependency on the `react` package. ([@acdlite](https://github.com/acdlite) in [df318bb](https://github.com/reactjs/prop-types/commit/df318bba8a89bc5aadbb0292822cf4ed71d27ace))
+
+**Note: this release has a critical issue and was deprecated. Please update to 15.5.7 or higher.**
+
+* No significant changes
 
 ## 15.5.2
+
+**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))
+
+## 15.5.1
+
+**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))
 
-## Before 15.5.2
+## Before 15.5.1
 
 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)