docs(babel): fix copy-and-pasted references to Jest

Author: ivomurrell

plugins/babel/readme.md

@@ -7,14 +7,14 @@ A plugin to run [Babel](https://babeljs.io/) to compile ES2015+ syntax.
 With Tool Kit [already set up](https://github.com/financial-times/dotcom-tool-kit#installing-and-using-tool-kit), install this plugin as a dev dependency:
 
 ```sh
-npm install --save-dev @dotcom-tool-kit/jest
+npm install --save-dev @dotcom-tool-kit/babel
 ```
 
 And add it to your repo's `.toolkitrc.yml`:
 
 ```yaml
 plugins:
-    - '@dotcom-tool-kit/jest'
+    - '@dotcom-tool-kit/babel'
 ```
 
 <!-- begin autogenerated docs -->