Add comprehensive tests for role middleware and fix package dependencies

node_modules/diff/CONTRIBUTING.md

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+# How to Contribute
+
+## Pull Requests
+
+We also accept [pull requests][pull-request]!
+
+Generally we like to see pull requests that
+
+- Maintain the existing code style
+- Are focused on a single change (i.e. avoid large refactoring or style adjustments in untouched code if not the primary goal of the pull request)
+- Have [good commit messages](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
+- Have tests
+- Don't decrease the current code coverage (see coverage/lcov-report/index.html)
+
+## Building
+
+```
+yarn
+yarn test
+```
+
+Running `yarn test -- dev` will watch for tests within Node and `karma start` may be used for manual testing in browsers.
+
+If you notice any problems, please report them to the GitHub issue tracker at
+[http://github.com/kpdecker/jsdiff/issues](http://github.com/kpdecker/jsdiff/issues).
+
+## Releasing
+
+A full release may be completed with the following:
+
+```
+yarn clean
+yarn grunt
+yarn grunt uglify
+yarn publish
+```