Correct serialization of atom extension

[andy128k]

Closes #141

[codecov[bot]]

Codecov Report

Merging #144 (7d2b434) into master (8cc6725) will increase coverage by 1.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #144      +/-   ##
==========================================
+ Coverage   80.39%   81.46%   +1.07%     
==========================================
  Files          24       24              
  Lines        1535     1543       +8     
==========================================
+ Hits         1234     1257      +23     
+ Misses        301      286      -15     

Impacted Files	Coverage Δ
src/channel.rs	88.67% <100.00%> (+0.93%)	:arrow_up:
src/extension/atom.rs	85.29% <100.00%> (+36.90%)	:arrow_up:
src/item.rs	91.51% <100.00%> (+0.71%)	:arrow_up:

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