Update environment to new control library

Author: alchemyst

environment.yml

@@ -8,7 +8,7 @@ dependencies:
   - numpy==1.16.4
   - scipy==1.3.0
   - sympy==1.4.0
-  - control=0.8.2
+  - control>=0.8.3
   - slycot=0.3.5
   - pandas=0.23.4
   - keras