Support for Python 2.6 and 3.3 should be dropped

[mbdevpl]

Supporting outdated Python versions hinders development, because you have to worry about compatibility with obsolete and insecure software.

https://devguide.python.org/#status-of-python-branches

• 2.6: end-of-life 2013-10-29
• 3.3: end-of-life 2017-09-29

As can be seen above, 2.6 was put to rest more than 4 years ago, and 3.3 almost half a year ago. EOL means no updates -- even security updates. Using these Python versions is a really bad idea anyway, so why even test for them?

[mbdevpl]

As can be seen in link below there are some dependency errors when building python-readchar on these EOL versions. So, it already doesn't work on those versions anyway...

https://travis-ci.org/mbdevpl/python-readchar/builds/339756231

[hugovk]

Python 2.6 and 3.3 are also little used.

Here's the pip installs for readchar from PyPI for last month:

python_version	percent	download_count
2.7	74.32%	2,191
3.6	19.40%	572
3.5	5.39%	159
3.4	0.81%	24
2.6	0.07%	2

Source: pypinfo --start-date -40 --end-date -10 --percent --pip --markdown readchar pyversion

[magmax]

Agree.