Disable Linux Travis tests, it got replaced by GitHub Actions

SiegeLordEx · SiegeLord · commit 926226d5a2ad · 2020-01-18T16:30:20.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@ language: c++
 
 os:
   - osx
-  - linux
 
 compiler:
   - clang

-Original file line number
+Diff line change
 os:
   - osx
 -  - linux
 compiler:
   - clang