make fields public

[AnderEnder]

Closes #71

[codecov]

Codecov Report

Merging #94 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #94   +/-   ##
=======================================
  Coverage   79.52%   79.52%           
=======================================
  Files          24       24           
  Lines        1724     1724           
=======================================
  Hits         1371     1371           
  Misses        353      353           

Impacted Files	Coverage Δ
src/category.rs	91.66% <ø> (ø)
src/channel.rs	79.28% <ø> (ø)
src/cloud.rs	86.66% <ø> (ø)
src/enclosure.rs	87.87% <ø> (ø)
src/extension/dublincore.rs	59.09% <ø> (ø)
src/extension/itunes/itunes_category.rs	100.00% <ø> (ø)
src/extension/itunes/itunes_channel_extension.rs	82.66% <ø> (ø)
src/extension/itunes/itunes_item_extension.rs	85.50% <ø> (ø)
src/extension/itunes/itunes_owner.rs	100.00% <ø> (ø)
src/extension/mod.rs	71.42% <ø> (ø)
... and 6 more

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