Drop support for Python < 3.4

[Marcelo-Theodoro]

What are your opinions about dropping support for Python < 3.4?

Python 2.7 is reaching end-of-life soon. And Python 3.0 to 3.3 are not supported anymore.

Maybe we could give an step foward and drop support for 3.4 too, because it's end of life will be in two months.

This will help us to support new versions of some frameworks while keeping the code clear.

[Marcelo-Theodoro]

@seocam Anything to say here?

[hugovk]

Drop 3.0 to 3.4.

Once EOL, they no longer receiving security updates (or any updates) from the core Python team.

Version	Release date	Supported until
2.5	2006-09-19	2011-05-26
2.6	2008-10-01	2013-10-29
3.0	2008-12-03	2009-06-27
3.1	2009-06-27	2012-04-09
3.2	2011-02-20	2016-02-27
3.3	2012-09-29	2017-09-29

Source: https://en.wikipedia.org/wiki/CPython#Version_history

They're also little used.

Here's the pip installs for restless from PyPI for December 2018:

category	percent	downloads
2.7	63.33%	1,900
3.6	25.23%	757
3.7	9.30%	279
3.5	1.17%	35
null	0.83%	25
3.4	0.13%	4
Total		3,000

Source: pypistats python_minor --last-month restless

[seocam]

I'm ok with dropping support from 3.0 to 3.4 (included). @toastdriven anything to add here?

[toastdriven]

Nope, it was simply state-of-the-art at the time. Drop it!

[hugovk]

Please see PR #116.