use .net core sdk 1.0.1

Edward Thomson · ethomson · commit 9ad39f98248a · 2017-04-04T09:38:16.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,7 @@
 
 language: csharp
 dist: trusty
-dotnet: latest
+dotnet: 1.0.1
 mono: latest
 
 os:
