Remove support for Python 3.6

https://peps.python.org/pep-0494/#lifespan

.github/workflows/python-non-master.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, '3.10']
+        python-version: [3.7, 3.8, 3.9, '3.10']
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/python.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, '3.10']
+        python-version: [3.7, 3.8, 3.9, '3.10']
 
     steps:
     - uses: actions/checkout@v2

README.md

@@ -187,7 +187,7 @@ how to get up and running with your first pull request.
 
 ## Notes
 
--   Works with Python 3.6 and newer. Unfortunately Python 2.7 support
+-   Works with Python 3.7 and newer. Unfortunately Python 2.7 support
     has been discontinued :(
 -   Special thanks to Rich Jones
     ([\@miserlou](https://github.com/miserlou)) for the idea

docs/introduction.md

@@ -17,7 +17,7 @@ print(“hello”)
 You'll need:
 
 - `pip`
-- Python 3.6 or above. Python 2.7 support is discontinued.
+- Python 3.7 or above. Python 2.7 support is discontinued.
 
 To install howdoi:
 

setup.py

@@ -76,7 +76,6 @@ setup(
         "Environment :: Console",
         "Intended Audience :: Developers",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",