fix link in bash script
fix link in bash script

Summary:
Google stopped to provide service for http-download.

Following #89, the link is changed to a location on github.

Reviewed By: piotr-bojanowski

Differential Revision: D4020056

fbshipit-source-id: d9abe5920f3e999f9c736575f38aedba47f7684e

facebookresearch/fastText,facebookresearch/fastText,facebookresearch/fastText,facebookresearch/fastText,facebookresearch/fastText,magicBus234/fastTextJob,magicBus234/fastTextJob,facebookresearch/fastText,magicBus234/fastTextJob,magicBus234/fastTextJob