Close GH-360: Update README.md.
Close GH-402: replace data attribute in <object> tag. Fixes #401
Add support for json files
Merge pull request #408 from AlexMeah/master

Add support for json files
Added support for <image> tags with xlink:href and src linking

closes #413
Added missing "{" in README.md. Fixes #423
Use SPDX ID of license in package.json
Add LICENSE
Merge pull request #426 from chulkilee/add-license-file

Add LICENSE
Merge pull request #425 from chulkilee/license-spdx-id

Use SPDX ID of license in package.json
Update dependencies.
Gruntfile.js: Fix `grunt-jscs` loading.
Close GH-421: Update revvedfinder.js.
2.4.0
Update README.md correcting post-processor name

The REAME.md states that to configure the uglify part, one needs to define a 'js' post-processor with name 'uglifyjs'.
It took me a while to understand that I could not get it working because the post-processor name is 'uglify' (without js) 
as can be seen under lib/config/uglifyjs.js : exports.name = 'uglify';
Merge pull request #440 from s-dubon/patch-1

Update README.md correcting post-processor name.
Adding support for a single srcset item. See #428.
only output modifications on verbose mode
Merge pull request #460 from fredoche/master

only output modifications on verbose mode
Merge pull request #457 from aendrew/428_support_srcset

Adds support for a single srcset item