add coefficients files for Gaia zero points to setup.py

setup.py

@@ -68,7 +68,8 @@
                                   'desitarget.sv3': ['data/*',],
                                   'desitarget.test': ['t/*',],
                                   'desitarget.mock': [os.path.relpath(_,'py/desitarget/mock') for _ in [os.path.join(_[0],'*') for _ in os.walk('py/desitarget/mock/data')]],
-                                 }
+                                  'desitarget.streams.gaia_dr3_parallax_zero_point': ['coefficients/*',],
+                                  }
 #
 # Run setup command.
 #