0.6.0 / 08.11.2015

• New optimization: circular curves are now being converted to arcs. A notable improvement for circles within paths.
• New plugin “minifyStyles” which minifies <style> elments content with CSSO by @strarsis (svgo still doesn't understand its content)
• New plugin “removeStyleElement” (disabled by default) by @betsydupuis.
• Fixed issues wuth parsing numbers with exponent fraction (could happen with high precision >= 7).
• Fixed rounding error due to incorrect preserving of precision in transformations.
• Fixed shortand curve distortion due to converted previous curve to not a curve.
• Fixed interoperability issue with precision cli-option and full config.
• Fixed an error produced by “removeUnknownsAndDefaults” by @thiakil
• Another Inkscape prefix namespace is being removed.
• Fixed an issue in moveElemsAttrsToGroup“” with transforms moved around clip-path.

0.5.6 / 13.08.2015

• Fixed paths removing.

0.5.5 / 05.08.2015

• Reverted debugging changes.

0.5.4 / 05.08.2015

• New parameter useShortTags by @bradbarrow. Now svgo can produce correct non-selfclosing tags (useful in HTML in old browsers).
• Fixed failing on empty transformation (which could be produced by two opposite).
• Fixed removing paths which have numbers with exponent notation.
• Fixed a bug with arc transformation.
• Some typo fixes.

0.5.3 / 21.06.2015

• Fixed breaking related to rounding functions in “convertTransform”.
• Fixed a bug with ID in animations not being worked on by “cleanupIDs”.
• Fixed a bug with quoted reference in url().
• Now, if there are several same IDs in the document, then the first one is used and others are being removed.
• New command-line option --show-plugins displaying list of plugins.
• Two new optional plugins: “removeDimensions” (removes width and height if there is viewBox) and “removeAttrsPlugin” (by @bennyschudel).

0.5.2 / 24.05.2015

• Introduced new transformPrecision option for better image quality (defaults to 5) in “convertTransform” and “convertPathData” (for the purpose of applying transformations) plugins.
• Matrix transformations now can be decomposed into a combination of few simple transforms like translate, rotate, scale.
• Arcs (paths arcto command) are now correctly being transformed into another arcs without being converting to Bezier curves.
• Fixed an issue with “mergePaths” failing to detect paths intersection in some cases.
• Fixed a bug with “removeUnknownsAndDefaults” removing some paths, which was introduced in v0.5.1.
• Fixed a bug with transformation having rotate() with optional parameters.
• Patterns with inherited attributes are no longer being removed.
• Styles are no longer being removed from <desc> (by @dennari).
• SVGO no longer breaks during parsing.
• Added clone() method to JSAPI (by @jakearchibald)

0.5.0 / 05.11.2014

• added --multipass command line option which repeatedly applies optimizations like collapsing groups (by @dfilatov)
• exposed JSAPI as a factory method (by @mistakster)
• added removeDesc plugin (by @dwabyick), disabled by default
• removeUselessStrokeAndFill plugin is disabled by default since it's unable to check inherited properties
• transformations now apply to paths with arcs in plugins/convertPathData
• a lot of bug fixes mostly related to transformations

v0.4.5 / 02.08.2014

• significally improved plugin plugins/convertPathData:
  • Now data is being written relative or absolute whichever is shorter. You can turn it off by setting utilizeAbsolute to false.
  • Smarter rounding: values like 2.499 now rounds to 2.5. Rounding now takes in account accumulutive error meaning that points will not be misplaced due to rounding more than it neccessary.
  • Fixed couple bugs.
• --output option now can be a folder along with --folder, thanks to @mako-taco.
• plugins/cleanupIDs now have prefix option in case you want to combine multiple svg later (by @DanielMazurkiewicz).
• Quotes now being escaped in attributes (by @ditesh).
• Minor bugfixes

v0.3.7 / 24.06.2013

• do not remove result attribute from filter primitives (fix #122)
• plugins/cleanupAttrs: replace newline with space when needed (fix #119)
• lib/coa: look for config file in current folder
• lib/coa: always traverse all files in the given folder
• deprecate svgo-grunt in favor of grunt-svgmin
• re-enable node-coveralls

v0.3.6 / 06.06.2013

• plugins/removeNonInheritableGroupAttrs: more attrs groups to exclude (fix #116 & #118)
• lib/coa: optimize folder file by file (temp fix #114)
• .jshintrc: JSHint 2.0
• temporarily disable node-coveralls