Upgrade required PHP version to 7.2

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-    - 7.1
     - 7.2
 
 sudo: false

README.md

@@ -16,7 +16,7 @@ For example, if your PIM is currently a v2.3, you can still use a 1.0 version of
 
 ## Requirements
 
-* PHP >= 7.1
+* PHP >= 7.2
 * Composer 
 
 ## Installation
@@ -148,10 +148,10 @@ These dependencies are different in function of the PHP version running `compose
 ```
 cp docker-compose.yml.dist docker-compose.yml
 rm -rf composer.lock vendor/
-docker-compose run client_71 composer install
-docker-compose run client_71 bin/phpunit -c phpunit.xml.dist
-docker-compose run client_71 bin/phpspec run
-docker-compose run client_71 bin/php-cs-fixer fix --diff --dry-run --config=.php_cs.php -vvv
+docker-compose run client_72 composer install
+docker-compose run client_72 bin/phpunit -c phpunit.xml.dist
+docker-compose run client_72 bin/phpspec run
+docker-compose run client_72 bin/php-cs-fixer fix --diff --dry-run --config=.php_cs.php -vvv
 ```
 
 ## Support

composer.json

@@ -20,7 +20,7 @@
     }
   },
   "require": {
-    "php": ">=7.1",
+    "php": ">=7.2",
     "psr/http-message": "^1.0",
     "php-http/httplug": "^2.0",
     "php-http/message": "^1.7",

docker-compose.yml.dist

@@ -1,21 +1,6 @@
 version: '2'
 
 services:
-  client_71:
-    image: akeneo/php:7.1
-    environment:
-      COMPOSER_HOME: /home/docker/.composer
-      PHP_IDE_CONFIG: 'serverName=akeneo-client'
-      PHP_XDEBUG_ENABLED: 0
-      PHP_XDEBUG_IDE_KEY: XDEBUG_IDE_KEY
-      PHP_XDEBUG_REMOTE_HOST: xxx.xxx.xxx.xxx
-      XDEBUG_CONFIG: 'remote_host=xxx.xxx.xxx.xxx'
-    user: docker
-    volumes:
-      - ./:/home/docker/client
-      - ~/.composer:/home/docker/.composer
-    working_dir: /home/docker/client
-
   client_72:
     image: akeneo/php:7.2
     environment: