Remove pygobject dep

requirements.in

 plac
 pylertalertmanager
-pygobject
+# Only needed for indicator.py
+# pygobject
 pyyaml

requirements.txt

@@ -20,10 +20,6 @@ pendulum==2.1.2
     # via maya
 plac==1.3.5
     # via -r requirements.in
-pycairo==1.23.0
-    # via pygobject
-pygobject==3.42.2
-    # via -r requirements.in
 pylertalertmanager==0.1.1
     # via -r requirements.in
 python-box==7.0.0