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

hazzik · fredericDelaporte · commit edadc1e1ff25 · 2020-01-13T21:23:21.000+01:00
(cherry picked from commit 8a7375a)
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,4 @@
+dist: trusty
 language: csharp
 mono: none
 dotnet: 2.1.2
