upgraded README for 6.0.0

Author: honzakral

README

@@ -31,28 +31,28 @@ Compatibility
 The library is compatible with all Elasticsearch versions since ``1.x`` but you
 **have to use a matching major version**:
 
-For **Elasticsearch 5.0** and later, use the major version 5 (``5.x.y``) of the
+For **Elasticsearch 6.0** and later, use the major version 5 (``6.x.y``) of the
 library.
 
-For **Elasticsearch 2.0** and later, use the major version 2 (``2.x.y``) of the
+For **Elasticsearch 5.0** and later, use the major version 5 (``5.x.y``) of the
 library.
 
-For **Elasticsearch 1.0** and later, use the major version 0 (``0.x.y``) of the
+For **Elasticsearch 2.0** and later, use the major version 2 (``2.x.y``) of the
 library.
 
 
 The recommended way to set your requirements in your `setup.py` or
 `requirements.txt` is::
 
+    # Elasticsearch 6.x
+    elasticsearch-dsl>=6.0.0,<7.0.0
+
     # Elasticsearch 5.x
     elasticsearch-dsl>=5.0.0,<6.0.0
 
     # Elasticsearch 2.x
     elasticsearch-dsl>=2.0.0,<3.0.0
 
-    # Elasticsearch 1.x
-    elasticsearch-dsl<2.0.0
-
 
 The development is happening on ``master``, ``2.x``, and ``1.x`` branches, respectively.
 
@@ -145,8 +145,7 @@ Let's have a simple Python class representing an article in a blogging system:
 .. code:: python
 
     from datetime import datetime
-    from elasticsearch_dsl import DocType, Date, Integer, Keyword, Text
-    from elasticsearch_dsl.connections import connections
+    from elasticsearch_dsl import DocType, Date, Integer, Keyword, Text, connections
 
     # Define a default Elasticsearch client
     connections.create_connection(hosts=['localhost'])