Revert "Switch to 3.7"

ata2001 · sebastinas · commit 725c9b78c3b4 · 2018-10-04T14:09:43.000+02:00
This reverts commit b214afa.
diff --git a/.travis.yml b/.travis.yml
@@ -9,7 +9,7 @@ python:
     - "3.4"
     - "3.5"
     - "3.6"
-    - "3.7"
+    - "3.7-dev"
     - "3.8-dev"
     - "pypy"
     - "pypy3"
@@ -20,6 +20,7 @@ env:
 
 matrix:
     allow_failures:
+        - python: "3.7-dev"
         - python: "3.8-dev"
         - python: "pypy"
         - python: "pypy3"
