<?php

namespace League\ColorExtractor\Laravel;

use Illuminate\Support\ServiceProvider;
use League\ColorExtractor\Client;

/**
 * @author Antoine Corcy <contact@sbin.dk>
 */
class ColorExtractorServiceProvider extends ServiceProvider
{
    /**
     * Indicates if loading of the provider is deferred.
     *
     * @var bool
     */
    protected $defer = false;

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->singleton('color-extractor', function ($app) {
            return new Client();
        });

        $this->app->alias('color-extractor', 'League\ColorExtractor\Client');
    }

    /**
     * Get the services provided by the provider.
     *
     * @return array
     */
    public function provides()
    {
        return array('color-extractor', 'League\ColorExtractor\Client');
    }
}

<?php

namespace League\ColorExtractor\Laravel;

use Illuminate\Support\ServiceProvider;
use League\ColorExtractor\Client;

/**
 * @author Antoine Corcy <contact@sbin.dk>
 */
class ColorExtractorServiceProvider extends ServiceProvider
{
    /**
     * Indicates if loading of the provider is deferred.
     *
     * @var bool
     */
    protected $defer = false;

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bindShared('color-extractor', function ($app) {
            return new Client();
        });

        $this->app->alias('color-extractor', 'League\ColorExtractor\Client');
    }

    /**
     * Get the services provided by the provider.
     *
     * @return array
     */
    public function provides()
    {
        return array('color-extractor', 'League\ColorExtractor\Client');
    }
}

--- 
+++ 
@@ -24,7 +24,7 @@
      */
     public function register()
     {
-        $this->app->bindShared('color-extractor', function ($app) {
+        $this->app->singleton('color-extractor', function ($app) {
             return new Client();
         });
 
Switch to singleton method for Laravel 5.2.