Remove Python 2.7 support

Remove support for 2.7 and below 3.6 Python version.
Elasticsearch from version 8.0 version, new library supports Python 3.6+.

Author: thoscilo

README.rst

@@ -26,14 +26,6 @@ Install using pip::
 
     pip install CMRESHandler
 
-Requirements Python 2
-=====================
-This library requires the following dependencies
- - elasticsearch
- - requests
- - enum
-
-
 Requirements Python 3
 =====================
 This library requires the following dependencies

setup.py

@@ -9,7 +9,6 @@
 # To use a consistent encoding
 from codecs import open
 from os import path
-import sys
 
 here = path.abspath(path.dirname(__file__))
 
@@ -22,10 +21,6 @@
     'requests'
 ]
 
-# If python version is above 3.4 (built in enums supported enums)
-if sys.version_info <= (3,4):
-    dependencies.append('enum')
-
 print("List of dependencies : {0}".format(str(dependencies)))
 
 setup(
@@ -67,7 +62,6 @@
 
         # Specify the Python versions you support here. In particular, ensure
         # that you indicate whether you support Python 2, Python 3 or both.
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3.6',
     ],