switch to python in shebang for conda package

Author: JacksonBurns

rmg.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python-jl
+#!/usr/bin/env python
 
 ###############################################################################
 #                                                                             #

utilities.py

@@ -310,7 +310,7 @@ def update_headers():
     start of each file, be sure to double-check the results to make sure
     important lines aren't accidentally overwritten.
     """
-    shebang = """#!/usr/bin/env python-jl
+    shebang = """#!/usr/bin/env python
 
 """