• Fixed collapseGroups plugin removing property with a child having inherit value.
• version attribute value is not more being rounded.
• Fixed jsAPI clone method with respect to the introduced CSS classes.
• Fixed scaling strokes with vector-effect="non-scaling-stroke" (by @alexjlockwood).
• Fixed passing properties from groups in collapseGroups plugin if child have a filter (by @stristr).
• Fixed arc path commands parsing without separators after flags, effectively producing a JS error.
• Fixed viewBox separators parsing.
• Fixed removeNonInheritableGroupAttrs plugin to work as intended.
• Fixed removing path segments without length in presence of stroke-linecap.
• Fixed removeUnknownsAndDefaults plugin removing attributes from elements with id.
• Fixed converting to large arcs from nearly straight lines curves.
• Fixed collapseGroups plugin affecting <switch> and its subgroups.
• Fixed convertTransform plugin converting to rotate() with wrong sign in some case.
• Fixed cleanupListOfValues plugin not preserving non-numeric values.
• Fixed !important being passed to attributes in convertStyleToAttrs plugin.
• Added option keepImportant to convertStyleToAttrs plugin to preserve styles with !important.
• removeHiddenElems plugin now also removes elements with visibility="hidden" attribute (by @mikolaj92).
• Added forceAbsolutePath option to convertPathData plugin to always use absolute coordinates (by @cool).
• Added keepRoleAttr for removeUnknownsAndDefaults plugin to preserve role- attributes (by @himedlooff).
• Added xmlns order option in sortAttrs plugin (by @hellatan).
• Added an option to prefixIds plugin to pass prefix as false or as a function that returns false (by @vzaidman).
• prefixIds plugin now adds prefix to every class (by @vzaidman).
• Updated and improved docs a bit (multiple authors).

Fixed issue with prefixIDs plugin not replacing url() values correctly (by @harrisjose).

• Fixed bug with removing groups that are direct child of <switch>.
• Fixed bug with shorthand path points counting (thanks @alexjlockwood for noticing).
• Fixed crash on parsing invalid transform, e.g. without close parenthesis.

• Fixed removeViewBox plugin to check for zero start coordinates.
• Removed extra info from STDOUT when it set to output.

• Fixed a couple of errors related to inlineStyles plugin.
• Updated some lost details in documentation to reflect v1.0 changes.

• Fixed error “Object.defineProperty called on non-object” in images with <foreignObject/>.

• 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.

• 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.

• 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).

• 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).