Enable 3.7 again since it got released

sebastinas · sebastinas · commit f363204db91d · 2018-11-27T20:26:27.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,7 +9,7 @@ python:
     - "3.4"
     - "3.5"
     - "3.6"
-    - "3.7-dev"
+    - "3.7"
     - "3.8-dev"
     - "pypy"
     - "pypy3"
@@ -20,7 +20,7 @@ env:
 
 matrix:
     allow_failures:
-        - python: "3.7-dev"
+        - python: "3.7"
         - python: "3.8-dev"
         - python: "pypy"
         - python: "pypy3"
