Upgrading required PHP version to >=7.0

This bump is because it took really long time to find suitable packages
for PHP 5.6.

.gitignore

@@ -1,2 +1 @@
-vendor
-composer.lock
+vendor

.travis.yml

@@ -1,12 +1,10 @@
 language: php
 php:
-  - 5.6
   - 7.0
   - 7.1
   - nightly
 matrix:
   allow_failures:
-    - php: 5.6
     - php: nightly
   fast_finish: true
 cache:

README.md

@@ -10,6 +10,8 @@
 This is a collection of Laravel Artisan commands created to help everyone
 in their development work. We try to keep these as useful as possible.
 
+This package requires PHP 7.0 or later. `composer.lock` has been generated with PHP v7.0.23.
+
 ## Install
 
 ### Step 1: Install Through Composer
@@ -77,3 +79,4 @@ The MIT License (MIT). Please see [License File](LICENSE.md) for more informatio
 [link-downloads]: https://packagist.org/packages/superhelio/commands
 [link-author]: https://github.com/superhelio
 [link-contributors]: https://github.com/superhelio/commands/graphs/contributors
+[link-dbal]: https://packagist.org/packages/doctrine/dbal

composer.json

@@ -17,13 +17,13 @@
         }
     ],
     "require": {
-        "php" : ">=5.6.0",
-        "illuminate/support": "~5.2"
+        "php" : ">=7.0",
+        "illuminate/support": "^5.3|^5.4|^5.5",
+        "doctrine/dbal": "^2.5|^2.6"
     },
     "require-dev": {
-        "phpunit/phpunit" : "^4.0|^5.0",
-        "orchestra/testbench": "~3.0",
-        "doctrine/dbal": "~2.3"
+        "phpunit/phpunit" : "^5.0",
+        "orchestra/testbench": "~3.0"
     },
     "autoload": {
         "psr-4": {