Remove PHP7.1 features

Author: akalongman

src/Lodash/Debug/DebugServiceProvider.php

@@ -16,7 +16,7 @@
 
 class DebugServiceProvider extends ServiceProvider
 {
-    public function boot(): void
+    public function boot()
     {
         $ips = config('lodash.debug.ips');
         $ip = app(Request::class)->getClientIp();
@@ -25,7 +25,7 @@ public function boot(): void
         }
     }
 
-    public function register(): void
+    public function register()
     {
     }
 }

src/Lodash/LodashServiceProvider.php

@@ -16,14 +16,14 @@
 
 class LodashServiceProvider extends ServiceProvider
 {
-    public function boot(): void
+    public function boot()
     {
         $this->publishes([
             __DIR__ . '/../config/config.php' => config_path('lodash.php'),
         ]);
     }
 
-    public function register(): void
+    public function register()
     {
 
         $this->app->singleton(