Update main.py

Add support for both Python2/Python3 rather than asking user to manually change the code as suggested in this comment: # If you can't use Python 3.x, please change "input" to "raw_input"

Author: rmccorm4

drive/driveapp/main.py

@@ -12,6 +12,12 @@
 import googleapiclient.http
 import oauth2client.client
 
+#Add user input support for both Python2 and Python3
+try: 
+    input = raw_input # Python2
+except:
+    pass # Python3
+
 # OAuth 2.0 scope that will be authorized.
 # Check https://developers.google.com/drive/scopes for all available scopes.
 OAUTH2_SCOPE = 'https://www.googleapis.com/auth/drive'