Fix travis by using Swift 5.1

Fred RAJAONA · Fred RAJAONA · commit 23c141fbc387 · 2019-10-10T14:23:14.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@ notifications:
 language: generic
 env:
   global:
-  - SWIFT_VERSION=5.0
+  - SWIFT_VERSION=5.1
 matrix:
   include:
     - os: osx
