Drop Python 3.7 support.

[wRAR]

No description provided.

[codecov]

Codecov Report

Merging #214 (1bb4b6e) into master (5393dbe) will not change coverage.
Report is 8 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head 1bb4b6e differs from pull request most recent head 6e158ac. Consider uploading reports for the commit 6e158ac to get more accurate results

@@           Coverage Diff           @@
##           master     #214   +/-   ##
=======================================
  Coverage   96.18%   96.18%           
=======================================
  Files           9        9           
  Lines         498      498           
  Branches       94       94           
=======================================
  Hits          479      479           
  Misses          9        9           
  Partials       10       10           

Files Changed	Coverage Δ
w3lib/__init__.py	100.00% <100.00%> (ø)

[wRAR]

I want to release 2.1.2 and only then merge this.