Remove static return types for PHP 7.4 compatibility (#9)

Author: jlevers

.gitignore

@@ -1,6 +1,8 @@
 vendor/
 resources/specs
 
+composer.lock
+
 # Log files
 **/*.log
 

.php-cs-fixer.dist.php

@@ -24,6 +24,7 @@
         'single_blank_line_at_eof' => false,
         'blank_line_after_namespace' => false,
         'no_leading_import_slash' => false,
+        'elseif' => false,
     ])
     ->setFinder($finder)
 ;

composer.json

@@ -54,7 +54,7 @@
         ],
         "version-update": "@generate --supporting-files-only",
         "clean": "rm -rf docs src/Models/*/* src/Apis/*/*/*",
-        "lint": "php vendor/bin/php-cs-fixer fix --allow-risky=yes -vvv"
+        "lint": "./vendor/bin/php-cs-fixer fix --allow-risky=yes -vvv"
     },
     "autoload": {
         "psr-4": { "Walmart\\" : "src/" }