core: drop php5.5 support

adhocore · adhocore · commit af25d12eb3ef · 2017-11-04T21:44:35.000+07:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,10 +1,10 @@
 language: php
 
 php:
-  - 5.5
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
 
 install:
   - composer install --prefer-dist
diff --git a/readme.md b/readme.md
@@ -11,7 +11,7 @@ Heavily work in progress and not yet ready!
 
 ## Installation
 
-Requires PHP5.5 or later.
+Requires PHP5.6 or later.
 
 ```bash
 composer require adhocore/underscore
