Do not test against PHP master (which already is PHP 8)

sebastianbergmann · sebastianbergmann · commit 1b417bfb2a5f · 2019-02-08T14:47:37.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -4,7 +4,6 @@ php:
   - 7.1
   - 7.2
   - 7.3
-  - master
 
 sudo: false
 

-Original file line number
+Diff line change
   - 7.1
   - 7.2
   - 7.3
 -  - master
 sudo: false