Fails to start with Spyder 4.2.1

[juliangilbey]

I know this package is currently unmaintained, but if someone does pick it up again:

In commit spyder-ide/spyder@305fb2e the initialize_plugin() method was removed from spyder.api.plugins.SpyderPluginWidget, which prevents this plugin from working.

Also, a more minor matter: since spyder.api.plugins uses super() for calling superclasses, this plugin should do the same, rather than calling the superclass explicitly as SpyderPluginWidget.__init__(...).

Best wishes, Julian