TASK: Modified Flowpack.ElasticSearch requirement to include 3.X

TASK: Modified Flowpack.ElasticSearch requirement to include 3.X (Backport of #299)

Author: daniellienert

composer.json

@@ -8,7 +8,7 @@
         "php": "^7.2",
         "ext-json": "*",
 
-        "flowpack/elasticsearch": "^2.0 || dev-master",
+        "flowpack/elasticsearch": "^2.0 || ^3.0 || dev-master",
         "neos/content-repository": "^3.3 || ^4.0 || dev-master",
         "neos/content-repository-search": "^3.0 || ^4.0 || dev-master",
         "neos/eel": "^4.3 || ^5.0 || dev-master",