Add changelog entry

Author: mattphillips

CHANGELOG.md

@@ -26,6 +26,7 @@
 
 ### Chore & Maintenance
 
+- `[jest-each]`: Migrate to Typescript ([#8007](https://github.com/facebook/jest/pull/8007))
 - `[jest-environment-node]`: Migrate to TypeScript ([#7985](https://github.com/facebook/jest/pull/7985))
 - `[*]`: Setup building, linting and testing of TypeScript ([#7808](https://github.com/facebook/jest/pull/7808), [#7855](https://github.com/facebook/jest/pull/7855), [#7951](https://github.com/facebook/jest/pull/7951))
 - `[pretty-format]`: Migrate to TypeScript ([#7809](https://github.com/facebook/jest/pull/7809), [#7809](https://github.com/facebook/jest/pull/7972))