Update composer to not limit php support with php 7.1

- Update readme file with new version number
- Update service provider with new version number

Author: candasm

README.md

@@ -1,4 +1,4 @@
-Laravel Elasticsearch Service Provider  (4.5.0)
+Laravel Elasticsearch Service Provider  (4.5.1)
 ================================================
 [![Latest Stable Version](https://poser.pugx.org/shift31/laravel-elasticsearch/v/stable)](https://packagist.org/packages/shift31/laravel-elasticsearch)
 [![Total Downloads](https://poser.pugx.org/shift31/laravel-elasticsearch/downloads)](https://packagist.org/packages/shift31/laravel-elasticsearch)

composer.json

@@ -8,7 +8,7 @@
     }
   ],
   "require": {
-    "php": ">=5.6 <=7.1",
+    "php": ">=5.6",
     "laravel/framework": "~4.2.0",
     "elasticsearch/elasticsearch": "~5.0"
   },

src/Shift31/LaravelElasticsearch/ElasticsearchServiceProvider.php

@@ -7,7 +7,7 @@
 
 class ElasticsearchServiceProvider extends ServiceProvider
 {
-    const VERSION = '4.5.0';
+    const VERSION = '4.5.1';
 
     /**
      * @inheritdoc