Add references to similar projects to README

Listed all Javascript projects from issue #230

Author: jehna

README.md

@@ -193,3 +193,11 @@ You can see an up to date list of all ports on [VerbalExpressions.github.io](htt
 - [Swift](https://github.com/VerbalExpressions/SwiftVerbalExpressions)
 
 If you would like to contribute another port (which would be awesome!), please [open an issue](https://github.com/VerbalExpressions/implementation/issues/new) specifying the language in the [VerbalExpressions/implementation repo](https://github.com/VerbalExpressions/implementation/issues). Please don't open PRs for other languages against this repo.
+
+### Similar projects
+
+Here's a list of other similar projects that implement regular expression
+builders:
+
+- https://github.com/MaxArt2501/re-build
+- https://github.com/mathiasbynens/regenerate