Increase minimum version of php and phpunit.

Author: chrisryan

.travis.yml

@@ -2,7 +2,6 @@ language: php
 php:
   - 7.0
   - 5.6
-  - 5.5
 env:
   - EXT_VERSION=1.1 DB_PACKAGE=mongodb-10gen
   - EXT_VERSION=1.1 DB_PACKAGE=mongodb-org

composer.json

@@ -21,14 +21,14 @@
     ],
     "license": "MIT",
     "require": {
-        "php": "~5.5||~7.0",
+        "php": "~5.6||~7.0",
         "dominionenterprises/util": "~1.4",
         "guzzle/http": "~3.7",
         "ext-curl": "*",
         "lib-curl": "~7.15"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0",
+        "phpunit/phpunit": "~5.0",
         "satooshi/php-coveralls": "~0.6.1",
         "squizlabs/php_codesniffer": "~1.5",
         "dominionenterprises/dws-coding-standard": "~1.1",