fix dotnet version in travis

ZEXSM · ZEXSM · commit 4cde0a4d5d98 · 2021-09-20T17:54:33.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 language: csharp
-dotnet: 3.1
+dotnet: 5.0
 mono: none
 solution: GraphQL.Tool.Embedded.sln
 branches:
