Bump NPM version to 0.3.1 in preparation for publishing.
Bump NPM version to 0.3.1 in preparation for publishing.

juliocanares/regenerator,sebmck/regenerator,kittens/regenerator,liviuignat/regenerator,kittens/regenerator,sebmck/regenerator,jlongster/transmogrifier,Jericho25/regenerator,rafaelstz/regenerator,jlongster/unwinder,facebook/regenerator,juliocanares/regenerator,facebook/regenerator,jlongster/unwinder,jlongster/unwinder,rafaelstz/regenerator,RReverser/js-goto-transpiler,Jericho25/regenerator,facebook/regenerator,liviuignat/regenerator,RReverser/js-goto-transpiler,jlongster/transmogrifier