PHP requirement increased to PHP 5.5 - See #599

.travis.yml

@@ -7,8 +7,6 @@ php:
   - 7.0
   - 5.6
   - 5.5
-  - 5.4
-  - 5.3
 install:
   - composer self-update
   - composer install --prefer-dist

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [v0.9.0](https://github.com/shaarli/Shaarli/releases/tag/v0.9.0) - UNPUBLISHED
 
+**WARNING**: Shaarli now requires PHP 5.5+. 
+
 ### Added
 
 ### Changed

composer.json

@@ -10,7 +10,7 @@
     },
     "keywords": ["bookmark", "link", "share", "web"],
     "require": {
-        "php": ">=5.3.4",
+        "php": ">=5.5",
         "shaarli/netscape-bookmark-parser": "1.*",
         "erusev/parsedown": "1.6"
     },