Allow using Elasticsearch-php 2.0

Author: timgws

composer.json

@@ -1,7 +1,7 @@
 {
   "name": "elasticquent/elasticquent",
   "type": "library",
-  "description": "Map Laravel Eloquent models to Elasticsearch types.",
+  "description": "Maps Laravel Eloquent models to Elasticsearch types.",
   "keywords": [
     "elasticsearch",
     "eloquent",
@@ -21,7 +21,7 @@
     "illuminate/support": "~4.2|~5.0",
     "illuminate/database": "~4.2|~5.0",
     "nesbot/carbon": "~1.0",
-    "elasticsearch/elasticsearch": "~1.0"
+    "elasticsearch/elasticsearch": ">1.0 <2.1"
   },
   "require-dev": {
     "phpunit/phpunit": "~4.0"