Remove eslint-plugin-jest-formatting since it was integrated into eslint-plugin-jest (#11)

See dangreenisrael/eslint-plugin-jest-formatting#122 (comment)

Author: maks-rafalko

README.md

@@ -131,10 +131,3 @@ In order to use the rules powered by TypeScript type-checking, you must be using
 The main plugin to be installed when Jest is used.
 
 <https://github.com/jest-community/eslint-plugin-jest>
-
-### eslint-plugin-jest-formatting
-
-This project aims to provide formatting rules (auto-fixable where possible) to
-ensure consistency and readability in jest test suites.
-
-<https://github.com/dangreenisrael/eslint-plugin-jest-formatting>