fix: remove v8.4.2 from the changelog

This was an incorrectly numbered release done as the first release of 
the automated tool, thanks to v8.5.0 previously not being on the 
`master` branch.

CHANGELOG.md

@@ -1,14 +1,3 @@
-## [8.4.2](https://github.com/AtomLinter/linter-eslint/compare/v8.4.1...v8.4.2) (2019-01-28)
-
-
-### Bug Fixes
-
-* **deps:** update dependency atom-package-deps to v5 ([9007292](https://github.com/AtomLinter/linter-eslint/commit/9007292))
-* **deps:** update dependency eslint-rule-documentation to v1.0.22 ([57e29a4](https://github.com/AtomLinter/linter-eslint/commit/57e29a4))
-* **deps:** update dependency fs-plus to v3.1.1 ([5c5d412](https://github.com/AtomLinter/linter-eslint/commit/5c5d412))
-
-# Changelog
-
 ## v8.5.0
 *  Organize configuration options ([#1042][])
 *  Add source.flow to default scopes ([#1194][])