Change requirements to PHP 7.2

Author: odan

README.md

@@ -22,7 +22,7 @@ composer require selective/database
 
 ## Requirements
 
-* PHP >= 7.1
+* PHP 7.2+
 * MySQL 5.7+, MariaDB
 
 ## Documentation

composer.json

@@ -13,12 +13,12 @@
     "license": "MIT",
     "require-dev": {
         "overtrue/phplint": "^1.1",
-        "phpunit/phpunit": "^6|^7",
-        "phpstan/phpstan-shim": "^0.11",
+        "phpunit/phpunit": "^7|^8|^9",
+        "phpstan/phpstan": "*",
         "squizlabs/php_codesniffer": "^3.4"
     },
     "require": {
-        "php": ">=7.1",
+        "php": ">=7.2",
         "ext-pdo": "*",
         "ext-json": "*"
     },