Small fix for npm package
Small fix for npm package

Until a permanent fix is made for building npm releasable packages, I've
added a small fix to the package.json file to allow for exported code.

NorthDecoder/jstat,jstat/jstat,akrawitz/jstat,cmpolis/jstat,JeebsM/jstat,ggonzale/jstat,jamescgibson/jstat,ggonzale/jstat,jstat/jstat,NorthDecoder/jstat,JeebsM/jstat,smarden1/jstat,akrawitz/jstat,smarden1/jstat