Correctly use atom:link instead of link for atom links

[NoraCodes]

<link rel="self> does not validate in https://validator.w3.org/feed, while this (<atom:link rel="self">) does.

[codecov[bot]]

Codecov Report

Merging #141 (1b001f7) into master (878bb2d) will increase coverage by 35.15%. The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master     #141       +/-   ##
===========================================
+ Coverage   45.14%   80.30%   +35.15%     
===========================================
  Files          26       24        -2     
  Lines        4357     1528     -2829     
===========================================
- Hits         1967     1227      -740     
+ Misses       2390      301     -2089     

Impacted Files	Coverage Δ
src/extension/atom.rs	46.87% <0.00%> (-16.96%)	:arrow_down:
src/extension/syndication.rs	72.72% <0.00%> (-3.08%)	:arrow_down:
src/extension/itunes/itunes_channel_extension.rs	97.89% <0.00%> (-0.29%)	:arrow_down:
src/error.rs	0.00% <0.00%> (ø)
src/extension/itunes/itunes_owner.rs	100.00% <0.00%> (ø)
src/extension/itunes/itunes_category.rs	100.00% <0.00%> (ø)
src/extension/itunes/itunes_item_extension.rs	100.00% <0.00%> (ø)
tests/write.rs
tests/read.rs
... and 6 more

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[icewind1991]

To use the atom: prefix you'll need to define the atom namespace, such as by adding xmlns:atom="http://www.w3.org/2005/Atom" to the <rss> root tag