chore: upgrade supported language versions (#111)

Author: childish-sambino

.github/workflows/test-and-deploy.yml

@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 20
     strategy:
       matrix:
-        python-version: [ '2.7', '3.5', '3.6', '3.7', '3.8', '3.9' ]
+        python-version: [ '2.7', '3.5', '3.6', '3.7', '3.8', '3.9', '3.10' ]
     steps:
       - name: Checkout sendgrid-python-smtpapi
         uses: actions/checkout@v2
@@ -42,7 +42,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.6'
+          python-version: '3.10'
 
       - name: Install dependencies
         run: |

setup.py

@@ -31,5 +31,7 @@
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
     ],
 )