Update README For 2.15.1

Author: wmonk

Diff for: README.md

@@ -53,6 +53,10 @@ To fix this, create a new file *in the root of the project* called `tsconfig.tes
 
 ## Changelog
 
+### 2.15.1
+* Fix duplicated mjs entry in Jest config - @StevenLangbroek
+* Allow `--watchAll` to be set - @DorianGrey
+
 ### 2.15.0
 * Replace TSLint rules with presets - @nielsdB97
 * Update file-loader exclusion rules - @winstonewert