Adding MySQL as a service required.

Author: renemadsen

.travis.yml

@@ -11,6 +11,8 @@ language: csharp
 mono: none
 dotnet: 2.2
 bundler_args: --retry 5
+services:
+- mysql
 before_install:
   - google-chrome-stable --headless --disable-gpu
 install:
@@ -39,4 +41,4 @@ script:
 after_success:
 - echo dotnet test and npm test succeeded
 after_faliure:
-- echo dotnet test and npm test failed
+- echo dotnet test and npm test failed