Merge pull request #3012 from gregg-miskelly/FixTravis

Update .NET SDK Version

Author: gregg-miskelly

.travis.yml

@@ -23,7 +23,7 @@ addons:
     packages:
       - g++-4.9
       - libsecret-1-dev
-      - dotnet-sdk-2.0.2
+      - dotnet-sdk-2.1
 
 install:
 - npm ci