build(travis): retire PHP pre 5.6

adhocore · web-flow · commit e92c1bb50fcc · 2019-09-19T19:09:50.000+07:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,8 +1,6 @@
 language: php
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - 7.1

-Original file line number
+Diff line change
@@ @@ -1,8 +1,6 @@ @@
 language: php
 php:
 -  - 5.4
 -  - 5.5
   - 5.6
   - 7.0
   - 7.1