Drop old and unsupported php version in v3

Author: acrobat

.travis.yml

@@ -11,16 +11,12 @@ env:
     - TEST_COMMAND="vendor/bin/phpunit --verbose --coverage-text"
 
 php:
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
   - 7.3
 
 matrix:
   include:
-    - php: hhvm
-      dist: trusty
     - php: 7.2
       name: Backward compatibillity check
       env: DEPENDENCIES="roave/backward-compatibility-check" TEST_COMMAND="./vendor/bin/roave-backward-compatibility-check"

README.md

@@ -19,7 +19,7 @@ Uses [GitHub API v3](http://developer.github.com/v3/) & supports [GitHub API v4]
 
 ## Requirements
 
-* PHP >= 5.6
+* PHP >= 7.1
 * A [HTTP client](https://packagist.org/providers/php-http/client-implementation)
 * A [PSR-7 implementation](https://packagist.org/providers/psr/http-message-implementation)
 * (optional) PHPUnit to run tests.

composer.json

@@ -17,7 +17,7 @@
         }
     ],
     "require": {
-        "php": "^5.6 || ^7.0",
+        "php": "^7.1",
         "psr/http-message": "^1.0",
         "psr/cache": "^1.0",
         "php-http/httplug": "^1.1",
@@ -27,7 +27,7 @@
         "php-http/cache-plugin": "^1.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.5 || ^6.0",
+        "phpunit/phpunit": "^6.0",
         "php-http/guzzle6-adapter": "^1.0",
         "php-http/mock-client": "^1.0",
         "guzzlehttp/psr7": "^1.2",