Make plugin load into 1.5.3/Python 3

Author: ManuelMcLure

octoprint_netconnectd/__init__.py

@@ -10,7 +10,7 @@
 import threading
 import netifaces
 from flask import jsonify, make_response
-from flask.ext.babel import gettext
+from flask_babel import gettext
 
 import octoprint.plugin
 from octoprint.server import admin_permission
@@ -311,12 +311,12 @@ def _log_state_timed(self, delay=0):
 
 
 __plugin_name__ = "Netconnectd Client"
-
+__plugin_pythoncompat__ = ">=3.7,<4"
 
 def __plugin_check__():
     import sys
 
-    if sys.platform == "linux2":
+    if sys.platform.startswith("linux"):
         return True
 
     logging.getLogger("octoprint.plugins." + __name__).warn(