Drop support for EOL Python 2.7

[hugovk]

For #440.

[lafrech]

Thank you so much for your work on this, @hugovk.

[hugovk]

You're welcome! Python 3.5 failed, I guess it needs some backports the non-stdlib mock package, but will check back in a bit.

[hugovk]

Updated and now ✅!

[sloria]

@hugovk Can you resolve the conflicts?

Once that's done and 6.0.0b1 is released, I think we're good to merge and release this cc @lafrech

[hugovk]

Updated and now ✅!

[lafrech]

Looks good to me.

I suspect simplejson was used in PY2 to compensate for shortcomings in core json.

We should also test against 3.8. Let's do that in another PR.

[sloria]

Yeah, the simplejson import can be removed, as it was only for Python 2 compat

webargs/setup.py

Lines 7 to 8 in c90e814

	if sys.version_info[0] < 3:
	INSTALL_REQUIRES.append("simplejson>=2.1.0")

[hugovk]

Does that mean we should use universal wheels?

diff --git a/setup.cfg b/setup.cfg
 [bdist_wheel]
-# We build separate wheels for
-# Python 2 and 3 because of the conditional
-# dependency on simplejson
-universal = 0
+universal = 1

[sloria]

Yes, good catch. We can build universal wheels now.

[hugovk]

Updated!

[lafrech]

Great. Let's move on with this.

[lafrech]

Released as 6.0.0b2 !

Thanks again @hugovk.

[hugovk]

You're welcome!