1.0.0 / 30.10.2017

• SVGO now requires Node 4 or higher.
• Changed CLI syntax to treat filenames as input, thus allowing svgo *.svg syntax.
• SVGO.optimize() now returns Promise.
• Added datauri option to JS API.
• Added support for SVG 2 href attribute.
• cleanupIDs now don't removes IDs if an image consists only of defs.
• New plugin inlineStyles for converting styles from <style> element to attributes if possible (by @strarsis).
• cleanupNumericValues now rounds values in viewBox (by @caub).
• New plugin: removeScriptElement (disabled by default) to align with removeStyleElement (by @pklingem).
• minifyStyles now removes styles based on usage with controlling options (by @lahmatiy).
• New option except in cleanupIDs to keep IDs (by @Velenir).
• New option force in cleanupIDs to work even if SVG contains style or script elements (by @Velenir).
• Fixed arcs transforming with different signed scale parameters (by @JoshyPHP).
• Fixed removeUselessStrokeAndFill to check for style or script elements per file (by @caub).
• New option keepAriaAttrs in removeUnknownsAndDefaults (by @davidtheclark).
• Corrected parsing in cleanupIDs to account animation syntax (by @caub).
• #ff0000 now converts to red as well as #f00 (by @davidleston).
• Added “gray” variation to colors list per CSS Color Module Level 4 (by @ydaniv).
• Fixed error on empty files.
• A separator character in removeAttrs now can be changed per elemSeparator option (by @mikestreety).
• addAttributesToSVGElement now can add values to attributes.

0.7.2 / 29.01.2017

• Extended currentColor match conditions (string, rx, bool) (by @AlimovSV)
• Fixed removing <animate> in <stop>.
• Fixed removing same transform in inner element in removeUnknownsAndDefaults.
• Fixed collapsing groups with same non-inheritable attribue.
• Corrected removing of leading zero in case of exponential notation.

0.7.1 / 27.09.2016

• Reverted the requirement of Node.js to version 0.10.
• Added addAttributesToSVGElement to the default config to allow using it with --enable option.
• Added korean translation of “How it works” doc (by @primeiros).

0.7.0 / 25.08.2016

• Required Node.js version has increased to 0.12.
• New plugins: removeElementsByAttr (by IDs or classes) by @elidupuis,
  addAttributesToSVGElement by @gjjones,
  removeXMLNS (for SVG inlining) by @ricardobeat.
• Tests now correctly pass in Windows with CRLF line endings. Pretty print now accounts system line endings.
• Fixed bugs with collapsing groups with masks and transforms in collapseGroups.
• Fixed bugs with erroneous removing IDs in cleanupIDs.
• Improved attributes sorting in sortAttrs by @darktrojan.
• addClassesToSVGElement no more repeats classes (by @ricardobeat).

0.6.6 / 25.04.2016

• Corrected CSSO API usage

0.6.5 / 25.04.2016

• Extra content inserted by editors are now being removed within <foreignObject> as well thus fixing bug “Namespace prefix … is not defined“ after applying SVGO.
• Doctype with entities declartion is now also being removed since SVGO correctly parses them starting from the version 0.6.2.
• Corrected moveGroupAttrsToElems not to move attributes to g content if it's referenced (has an id).
• collapseGroups now don't collapse a group if it has an animated attribute (SMIL).

0.6.4 / 05.04.2016

• Fixed bug in “convertStyleToAttrs” plugin with converting styling properties to non-existent attributes (which are normally removed later by removeUnknownsAndDefaults).
• Added --indent option to style pretty-printed SVG. (e.g. --indent 2) (by @scurker).
• Added currentColor param to convertColors plugin for converting values like fill and stroke to currentColor (by @scurker).
• Bumped CSSO to the current version and used its new shiny API (thanks to @lahmatiy).

0.6.3 / 20.03.2016

• Smart rounding (introduced in 0.4.5) now applies only when rounding is needed, thus making subsequent passes more stable.
• Fixed regression in converting curves to arcs.
• xlink:href references are now being checked by local name href, thus correctly working with another namespace prefix.
• Fixed id removing with disabled plugins/convertStyleToAttrs.js.

0.6.2 / 08.03.2016

• Better error handling and messaging improvements.
• SVG files with XML entities (e.g. from Adobe Illustrator) are now correctly being parsed.
• Fixed error on converting curves to arcs.
• Corrected rounding in subsequent passes with --multipass option.
• Data URI option now handles charset (by @holymonson)
• Tranformations are no longer moved to group if there is a mask (plugins/moveElemsAttrsToGroup.js).
• Fixed matrix decomposition losing sign in case like [1, 0, 0, -1, 0, 0] (scale(1 -1)).
• Fixed crash on uppercased color name.
• Paths with id and without stroke-width aren't being trasformed now since stroke-width may be applied later.

0.6.1 / 21.11.2015

• Added option --quite to suppress output (by @phihag).
• Removed lib-cov folder from the package, which was erroneously included before.
• Fixed errors in “minifyStyles” when there are <style> elements with CDATA content or without content at all.
• Amended transform functions parsing to prevent errors when there are no separators between numbers (which isn't allowed by syntax, but understood by browsers).