Fix: CI was broken because of aiomqtt update (#40)

Problem: aiomqtt has been taken over by a completely different
team and the new version (1.0.0) is completely incompatible with
our current example.

Solution: use the latest version of the old project.

Author: odesenfans

setup.cfg

@@ -59,7 +59,7 @@ exclude =
 # PDF = ReportLab; RXP
 # Add here test requirements (semicolon/line-separated)
 testing =
-    aiomqtt
+    aiomqtt<=0.1.3
     psutil
     pytest
     pytest-cov
@@ -80,7 +80,7 @@ testing =
     isort
     flake8
 mqtt =
-    aiomqtt
+    aiomqtt<=0.1.3
     certifi
     Click
 nuls2 =