Update version number

Docs/source/conf.py

@@ -58,7 +58,7 @@ author = 'WarpX collaboration'
 # built documents.
 #
 # The short X.Y version.
-version = '19.02'
+version = '19.04'
 # The full version, including alpha/beta/rc tags.
 release = ''
 

LICENSE.txt

-WarpX v19.02 Copyright (c) 2018, The Regents of the University of California, through Lawrence Berkeley National Laboratory, and Lawrence Livermore National Security, LLC, for the operation of Lawrence Livermore National Laboratory (subject to receipt of any required approvals from the U.S. Dept. of Energy). All rights reserved.
+WarpX v19.04 Copyright (c) 2018, The Regents of the University of California, through Lawrence Berkeley National Laboratory, and Lawrence Livermore National Security, LLC, for the operation of Lawrence Livermore National Laboratory (subject to receipt of any required approvals from the U.S. Dept. of Energy). All rights reserved.
 
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Python/setup.py

@@ -20,7 +20,7 @@ else:
     package_data = {}
 
 setup (name = 'pywarpx',
-       version = '19.02',
+       version = '19.04',
        packages = ['pywarpx'],
        package_dir = {'pywarpx':'pywarpx'},
        description = """Wrapper of WarpX""",