update swig link

Author: fatihky

Readme.md

@@ -37,7 +37,7 @@
   - [ractive](https://github.com/Rich-Harris/Ractive)
   - [react](https://github.com/facebook/react)
   - [slm](https://github.com/slm-lang/slm)
-  - [swig (unmaintained)](https://github.com/paularmstrong/swig)
+  - [swig (maintained fork)](https://github.com/node-swig/swig-templates)
   - [templayed](http://archan937.github.com/templayed.js/)
   - [twig](https://github.com/justjohn/twig.js)
   - [liquid](https://github.com/leizongmin/tinyliquid) [(website)](http://liquidmarkup.org/)