Update MANIFEST.in
Update MANIFEST.in

fix the issue which failed to compile the confluent_client, it is due to the add confluent_env.csh in profile, but not add it in MANIFEST
jjohnson42/confluent,whowutwut/confluent,whowutwut/confluent,xcat2/confluent,whowutwut/confluent,xcat2/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,whowutwut/confluent,jjohnson42/confluent,jjohnson42/confluent,xcat2/confluent,jjohnson42/confluent