Update travis to 2.2.203

Jimmy Byrd · Jimmy Byrd · commit 79a2703496f6 · 2019-09-12T20:51:43.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ language: csharp
 sudo: required
 dist: trusty
 
-dotnet: 2.1.401
+dotnet: 2.2.203
 mono:
   - 5.14.0
   - latest # => "stable release"
