Octoprint 1.4.0rc1 support

[sebaminguez]

Describe the bug Plugin doesn't work on Octoprint Release 1.4.0rc1

Steps to reproduce

1. Update octoprint to 1.4.0rc1
2. Verify that plugin is disabled

Expected behavior Plugin still enabled

Did the same happen when all other 3rd party plugins are disabled? Yes,

Log file octoprint.plugin.core - ERROR - Exception while initializing plugin filamentmanager, disabling it Traceback (most recent call last): File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/plugin/core.py", line 1439, in initialize_implementation implementation.initialize() File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint_filamentmanager/__init__.py", line 53, in initialize self.filamentOdometer.set_g90_extruder(self._settings.getBoolean(["feature", "g90InfluencesExtruder"])) File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/plugin/__init__.py", line 521, in __getattr__ orig_func = decorator(orig_func) File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/__init__.py", line 134, in decorator func.__qualname__ = to_native_str('warning_decorator_factory') AttributeError: 'instancemethod' object has no attribute '__qualname__' octoprint.log

[sebaminguez]

Solved on the octoprint side https://github.com/foosel/OctoPrint/issues/3347