Updated Travis yml.

Author: jernejk

.travis.yml

@@ -1,6 +1,11 @@
 language: csharp
 mono: none
+sudo: required
+dist: xenial
 dotnet: 2.2
 script:
- - dotnet restore
- - dotnet build AspNetCoreSerilogExample.sln -c Release
+    - dotnet restore
+    - dotnet build AspNetCoreSerilogExample.sln -c Release
+global:
+    - DOTNET_SKIP_FIRST_TIME_EXPERIENCE=true
+    - DOTNET_CLI_TELEMETRY_OPTOUT=1