Offer help when . bin/activate is missing.

twgs-proxy.py

@@ -1,7 +1,12 @@
 #!/usr/bin/env python3
 
 import sys
-from twisted.internet import reactor
+try:
+    from twisted.internet import reactor
+except ImportError:
+    print("\x1b[1mHey!\x1b[0m Activate your venv first!")
+    sys.exit(2)
+
 from twisted.internet import protocol
 import logging
 import logging.config