fix(build): mark as python>=3.6 in setup.py///

bump ver 2.1.0 --> 2.1.1.dev0

Author: ankostis

graphtik/__init__.py

@@ -3,7 +3,7 @@
 """Lightweight computation graphs for Python."""
 
 __author__ = "hnguyen"
-__version__ = "2.1.0"
+__version__ = "2.1.1.dev0"
 __release_date__ = "20 Oct 2019, 01:30"
 __license__ = "Apache-2.0"
 __title__ = "graphtik"

setup.py

@@ -34,6 +34,7 @@
         "Bug Tracker": "https://github.com/pygraphkit/graphtik/issues",
     },
     packages=["graphtik"],
+    python_requires='>=3.6',
     install_requires=[
         "networkx; python_version >= '3.5'",
         "networkx == 2.2; python_version < '3.5'",