Merge pull request #6 from Nyholm/patch-1

Allow php 5.4 and added badge for codecov

Author: Nyholm

.travis.yml

@@ -3,6 +3,7 @@ php:
   - "7.0"
   - "5.6"
   - "5.5"
+  - "5.4"
 
 matrix:
   fast_finish: true

README.md

@@ -1,5 +1,5 @@
 # Taggable PSR-6 cache
-[![Build Status](https://travis-ci.org/php-cache/taggable-cache.svg)](https://travis-ci.org/php-cache/taggable-cache)
+[![Build Status](https://travis-ci.org/php-cache/taggable-cache.svg)](https://travis-ci.org/php-cache/taggable-cache) [![codecov.io](https://codecov.io/github/php-cache/taggable-cache/coverage.svg?branch=master)](https://codecov.io/github/php-cache/taggable-cache?branch=master)
 
 This repository has one trait and one interfaces that makes a PSR-6 cache implementation taggable. Using tags allow you 
 to tag related items, and then clear the cached data for that tag only.

composer.json

@@ -19,7 +19,7 @@
     ],
     "require":
     {
-        "php":       "^5.5|^7",
+        "php":       "^5.4|^7",
         "psr/cache": "1.0.0"
     },
     "require-dev":  {