Merge pull request #531 from tableau/trying_without_python_3.6

want to try github actions without python 3.6

Author: dleskosky

.github/workflows/push.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:

setup.py

@@ -39,7 +39,6 @@ def read(fname):
             "Intended Audience :: Developers",
             "Intended Audience :: Science/Research",
             "License :: OSI Approved :: MIT License",
-            "Programming Language :: Python :: 3.6",
             "Programming Language :: Python :: 3.7",
             "Programming Language :: Python :: 3.8",
             "Topic :: Scientific/Engineering",
@@ -60,7 +59,7 @@ def read(fname):
                 "tabpy_server/common/default.conf",
             ]
         },
-        python_requires=">=3.6",
+        python_requires=">=3.7",
         license="MIT",
         # Note: many of these required packages are included in base python
         # but are listed here because different linux distros use custom