Improve composer compatibility

fixes #19

composer.json

@@ -5,10 +5,6 @@
     "license": "MIT",
     "comment": "league/flysystem and guzzlehttp/guzzle are provided by shopware",
     "keywords": ["shopware", "s3", "aws"],
-    "replace": {
-        "league/flysystem": "~1.0",
-        "guzzlehttp/guzzle": "~5.3.1"
-    },
     "extra": {
         "installer-name": "SwagMediaS3"
     },

plugin.xml

@@ -1,14 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <plugin xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/shopware/shopware/5.2/engine/Shopware/Components/Plugin/schema/plugin.xsd">
+        xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/shopware/shopware/5.4/engine/Shopware/Components/Plugin/schema/plugin.xsd">
 
     <label lang="de">Media Adapter: S3</label>
     <label lang="en">Media adapter: S3</label>
 
-    <version>1.0.1</version>
+    <version>2.0.0</version>
     <copyright>(c) by shopware AG</copyright>
     <license>proprietary</license>
     <author>shopware AG</author>
-    <compatibility minVersion="5.2.0" />
-
-</plugin>
+    <compatibility minVersion="5.4.0" />
+</plugin>