Fix travis file...

.travis.yml

@@ -3,8 +3,8 @@ solution: MQTTnet.sln
 
 matrix:
   include:
-    dotnet: 1.0.1
+    - dotnet: 1.0.1
       mono: none
       dist: trusty
       env: DOTNETCORE=1  # optional, can be used to take different code paths in your script
-    mono: latest
+    - mono: latest