Pinpoint Travis CI to using Ubuntu Trusty (14.04) to fix Firebird

hazzik · bahusoid · commit 9a302254a57a · 2020-01-13T09:53:33.000+02:00
(cherry picked from commit 8a7375a)
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,4 @@
+dist: trusty
 language: csharp
 mono: latest
 dotnet: 2.1.300
