Bump to 1.3.7. This includes mainly removal of large filterbank files to an outside source, and JOSS paper initial submission (not last version).  
Bump to 1.3.7. This includes mainly removal of large filterbank files to an outside source, and JOSS paper initial submission (not last version).  

Former-commit-id: a6452dce960c7f70dfd2d348c7dd514c4db0c238
UCBerkeleySETI/blimpy,UCBerkeleySETI/blimpy