remove Python2 support in command_line_runner

Description

README.md says,

Unfortunately Python 2.7 support has been discontinued 😦

I think we can drop support for the older version of Python here.

I am not sure if we still need utf-8 encoding. Maybe we can do like this?

utf8_result = howdoi(args).encode('utf-8', 'ignore')
sys.stdout.buffer.write(utf8_result)

# or
result = howdoi(args)
print(result)

Have you read the Contributing Guidelines on Pull Requests on mkdocs?

Yes

[ykskks]

@gleitz I submitted a PR #427.

I will work on page_cache problem in another issue!

[gleitz]

I had this problem as well! The tests seem to run properly when I open a PR, but locally when they run they throw this error.

I was wondering if somehow the page_cache is not being used when running the test locally. It’s almost as if it’s making the live call to StackOverflow rather than using the cache.