Set to version 1.3.1.

Marc Sallin · Marc Sallin · commit 9c73a79f15b3 · 2017-06-01T08:48:01.000+02:00
diff --git a/release_appveyor.yml b/release_appveyor.yml
@@ -1,4 +1,4 @@
-version: 1.3.0.{build}
+version: 1.3.1.{build}
 branches:
   only:
   - master
