add diff-match-patch requirement

Insmael · Insmael · commit 44b70c243ed1 · 2020-03-16T16:29:04.000-03:00
diff --git a/requirements.txt b/requirements.txt
@@ -6,3 +6,4 @@ six==1.11.0
 urllib3==1.24.2
 Pypubsub==4.0.3
 python-socketio==4.4.0
+diff-match-patch==20181111
