"sticky" is not a position value

[ganlanyuan]

Seems the validator need to be updated.

[gchudnov]

Updated the dependencies, released the updated version.

However the parent dependency gulp seems to be out of date. And you'll get the following warnings on installation:

npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated graceful-fs@1.2.3: graceful-fs v3.0.0 and before will fail on node releases >= v7.0. Please update to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree.

To avoid these warnings, you can use the parent library w3c-css without gulp.

[ganlanyuan]

Thanks a lot, will try this and back to you