build: set minimum php version requirement to 7.1

Author: ecastro98

README.md

@@ -9,7 +9,7 @@ See the [official wiki page](https://wiki.multitheftauto.com/wiki/PHP_SDK) for f
 
 ### Prerequisites
 
-This SDK requires PHP 7.3 or greater.
+This SDK requires PHP 7.1 or greater.
 
 ### Setup
 

azure-pipelines.yml

@@ -3,7 +3,7 @@ pool:
   vmImage: 'ubuntu-latest'
 
 variables:
-  phpVersion: 7.3
+  phpVersion: 7.1
 
 steps:
   - script: |

composer.json

@@ -13,7 +13,7 @@
         "wiki": "https://wiki.multitheftauto.com/wiki/PHP_SDK"
     },
     "require": {
-        "php": "^7.3",
+        "php": "^7.1",
         "ext-json": "^1.5",
         "php-http/client-implementation": "^1.0",
         "php-http/httplug": "^2.0",
@@ -29,6 +29,9 @@
         "phpunit/phpunit": "^7"
     },
     "config": {
+        "platform": {
+            "php": "7.1"
+        },
         "preferred-install": {
             "*": "dist"
         },