Fix late config binding (#5)

* Fix late config binding

* Add changelog entry

Author: DannyvdSluijs

CHANGELOG.md

@@ -5,10 +5,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Late config binding added for runtime override
 
 ## [1.1.1] - 2020-07-12
 ### Fixed
-- Make JsonMapperInterface availalbe in ServiceProvider
+- Make JsonMapperInterface available in ServiceProvider
 
 ## [1.1.0] - 2020-07-12
 ### Fixed

src/ServiceProvider.php

@@ -20,8 +20,8 @@ public function register()
     {
         $this->mergeConfigFrom(self::CONFIG_FILE, 'json-mapper');
 
-        $config = config('json-mapper.type');
-        $this->app->singleton(JsonMapperInterface::class, static function () use ($config) {
+        $this->app->singleton(JsonMapperInterface::class, function ($app) {
+            $config = $app->get('config')->get('json-mapper.type');
             switch ($config) {
                 case 'best-fit':
                     return (new JsonMapperFactory())->bestFit();