Update .NET version

0x007E · 0x007E · commit 3c43d0aea243 · 2022-07-17T19:04:00.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,7 +6,7 @@ dist: xenial
 language: csharp
 solution: ExceptionLib.sln
 mono: none
-dotnet: 5.0.301
+dotnet: 6.0.301
 
 addons:
   apt:
