Update pypy so it hopefully is found in trusty python archive

jsmnbom · jsmnbom · commit 3dabc3146a9a · 2017-06-22T19:29:34.000+02:00
See also python-telegram-bot#655
diff --git a/.travis.yml b/.travis.yml
@@ -5,8 +5,8 @@ python:
   - "3.4"
   - "3.5"
   - "3.6"
-  - "pypy"
-  - "pypy3"
+  - "pypy-5.8.0"
+  - "pypy3.5-5.8.0"
 
 dist: trusty
 sudo: false
