test: lock Twisted to 16.5

jchampio · jchampio · commit f1b3e67686ca · 2020-07-04T19:03:09.000-07:00
...due to issue #31, which doesn't look like it has a resolution yet upstream. Since 16.5 is a really old version of Twisted, this is a problem. Might have to switch to asyncio during the Python 3 move.
diff --git a/test/requirements.txt b/test/requirements.txt
@@ -4,5 +4,6 @@ psutil>=3.2.2,~=3.2
 pytest>=2.8.1,~=2.8
 pytest-twisted~=1.5
 tap.py~=1.7
+Twisted==16.5
 txaio~=2.1.0
 yamlish~=0.18.0
