Code coverage, verify PHP 5.6, 7, 7.1 and 7.2 (#3)

Author: webignition

.gitignore

@@ -1,4 +1,3 @@
-/nbproject
 /vendor
-/composer.phar
+/build
 /.idea

.travis.yml

@@ -1,9 +1,10 @@
 sudo: false
 language: php
 php:
-  - 5.5
   - 5.6
   - 7
+  - 7.1
+  - 7.2
 
 install:
   - composer install

circle.yml

@@ -1,12 +1,9 @@
 machine:
   php:
-    version: 5.5.36
+    version: 5.6.22
 
 test:
   override:
-# PHP 5.5.36
-    - php -v
-    - composer ci
 # PHP 5.6.22
     - phpenv global 5.6.22
     - php -v
@@ -18,4 +15,10 @@ test:
     - php -v
     - rm -rf vendor
     - composer install
-    - composer ci
+    - composer ci
+# PHP 7.1.9
+    - phpenv global 7.1.9
+    - php -v
+    - rm -rf vendor
+    - composer install
+    - composer ci

composer.json

@@ -26,12 +26,12 @@
         ]
     },
     "require": {
-        "php": ">=5.3.0",
+        "php": ">=5.6.0",
         "webignition/quoted-string":">=0.2.1,<1.0",
         "webignition/string-parser":">=0.2.3,<1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0",
+        "phpunit/phpunit": "~5.0",
         "squizlabs/php_codesniffer": "3.*"
     },
     "minimum-stability":"dev",