Log Message:
Update to 0.5.2.1

changes:
0.5.2.1
 - Add CHANGELOG to Extra-source-files
0.5.2.0
 * Provide ToHtml and ToValue instances for Int32, Int64, Word, Word32,
   and Word64  Closes #8
0.5.1.7
 - Merge pull request #7 from DougBurke/patch-1
   Bump text dependency
( #8 => https://github.com/jaspervdj/blaze-markup/issues/8 )
( #7 => https://github.com/jaspervdj/blaze-markup/pull/7 )