Introduce `URI.encode_www_form/1` function
Fix edge cases for `URI.decode/1`
Introduce `URI.decode_www_form/1` function
Merge pull request #2402 from lexmag/encode-www-form

Introduce `URI.encode(decode)_www_form/2` functions
Log when tasks go down
Update CHANGELOG
Fix path normalization of "/.."

Closes #2404.