Latest python support

Author: odarbelaeze

.github/workflows/pythonpackage.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2
@@ -49,4 +49,4 @@ jobs:
         sap describe example/sample.isi
         sap root example/sample.isi
         sap trunk example/sample.isi
-        sap leaf example/sample.isi
+        sap leaf example/sample.isi

setup.py

@@ -33,9 +33,9 @@
         "License :: OSI Approved :: MIT License",
         "Natural Language :: English",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
     ],
     description="Python Tree of Science package",
     entry_points={"console_scripts": ["sap=sap.cli:main"]},