Fix gitignore file.
Fix gitignore file.

yebrahim/datalab,googledatalab/datalab,parthea/datalab,parthea/datalab,craigcitro/datalab,yebrahim/datalab,craigcitro/datalab,googledatalab/datalab,craigcitro/datalab,googledatalab/datalab,parthea/datalab,craigcitro/datalab,googledatalab/datalab,parthea/datalab,googledatalab/datalab,parthea/datalab,googledatalab/datalab,yebrahim/datalab,parthea/datalab,craigcitro/datalab,yebrahim/datalab,yebrahim/datalab