Signed-off-by: David Runge <dvzrv@archlinux.org>

Signed-off-by: David Runge <dvzrv@archlinux.org>

This was dropped with dropping 3.5 support.

https://github.com/geopy/geopy/commit/9ef1a06814c1aedb30dd4a932eb15cfb4a9a5e06

Switch to VCS sources, as PyPi does not provide signatures anymore, which breaks reproducibility.
https://github.com/geopy/geopy/issues/550

Remove unnecessary quotes and curly braces.
Switch to PEP517.
Add all available optdepends.

archlinux/devtools!109 (comment 74475)

Upstream switched PGP keys, but did not sign the new key with the old key.
On request upstream provided a signed message verifying that the old key is
still under their control and that the switch to the new key has been
intentional:
https://github.com/geopy/geopy/issues/463

Disable flaky tests requiring internet access.

Adding new optdepends (python-aiohttp, python-requests).
Upstream dropped py2 support, so no more python-six \o/

Removing unneeded fix for failing tests.