Replace reference to PySide with PySide2

Author: t20100

LICENSE

@@ -5,7 +5,7 @@ Silx follows the permissive MIT license although it may include contributions fo
 Silx uses the Qt library for its graphical user interfaces.
 A word of caution is to be provided.
 If users develop and distribute software using modules accessing Qt by means of Riverbank Computing Qt bindings PyQt4 or PyQt5, those users will be conditioned by the license of their PyQt4/5 software (GPL or commercial).
-If the end user does not own a commercial license of PyQt4 or PyQt5 and wishes to be free of any distribution condition, (s)he should be able to use PySide because it uses the LGPL license.
+If the end user does not own a commercial license of PyQt4 or PyQt5 and wishes to be free of any distribution condition, (s)he should be able to use PySide2 because it uses the LGPL license.
 
 The MIT license follows:
 

run_tests.py

@@ -381,7 +381,7 @@ def get_test_options(project_module):
                          "INFO messages. Use -vv for full verbosity, " +
                          "including debug messages and test help strings.")
 parser.add_argument("--qt-binding", dest="qt_binding", default=None,
-                    help="Force using a Qt binding, from 'PyQt4', 'PyQt5', or 'PySide'")
+                    help="Force using a Qt binding, from 'PyQt4', 'PyQt5', or 'PySide2'")
 if test_options is not None:
     test_options.add_parser_argument(parser)