Add release cutters to changelog

CHANGELOG.md

 ## 0.9.0 (February 11, 2017)
 
+Thanks to [@Timer](https://github.com/timer) for cutting this release.
+
 #### :rocket: New Feature
 
 * `react-scripts`
@@ -164,6 +166,8 @@ If you relied on the browser not starting in non-interactive terminals, you now
 
 ## 0.8.5 (January 9, 2017)
 
+Thanks to [@fson](https://github.com/fson) for cutting this release.
+
 #### :bug: Bug Fix
 * `create-react-app`, `react-scripts`
   * [#1365](https://github.com/facebookincubator/create-react-app/pull/1365) Use yarnpkg alias to run Yarn. ([@fson](https://github.com/fson))
@@ -415,6 +419,8 @@ npm install --save-dev --save-exact react-scripts@0.8.2
 
 ## 0.8.1 (December 4, 2016)
 
+Thanks to [@fson](https://github.com/fson) for cutting this release.
+
 #### :bug: Bug Fix
 * `react-scripts`
   * [#1149](https://github.com/facebookincubator/create-react-app/pull/1149) Fix incorrectly stubbing JavaScript files with a dot in the import path in tests. ([@fson](https://github.com/fson))
@@ -429,6 +435,8 @@ npm install --save-dev --save-exact react-scripts@0.8.1
 
 ## 0.8.0 (December 3, 2016)
 
+Thanks to [@fson](https://github.com/fson) for cutting this release.
+
 #### :rocket: New Feature
 * `react-scripts`
   * [#944](https://github.com/facebookincubator/create-react-app/pull/944) Crash the build during CI whenever linter warnings are encountered. ([@excitement-engineer](https://github.com/excitement-engineer))
@@ -583,6 +591,8 @@ npm install --save-dev --save-exact react-scripts@0.8.0
 
 ## 0.7.0 (October 22, 2016)
 
+Thanks to [@fson](https://github.com/fson) for cutting this release.
+
 ### Build Dependency (`react-scripts`)
 
 * Updates Jest to [version 16.0](http://facebook.github.io/jest/blog/2016/10/03/jest-16.html), with an upgraded CLI, improved snapshot testing, new matchers and more. ([@chase](https://github.com/chase) in [#858](https://github.com/facebookincubator/create-react-app/pull/858))