Outdated dependency: 'tar'

[ajmas]

The dependency for 'tar' is 2.2.1, while the latest available version is 4.0.1.

This is an issue, since an npm install will warn:

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.

This will thus be an issue for anyone who wishes to use a more recent version of nodejs (>= v7.0).

For this reason the dependency should be updated.

[ajmas]

Just seen there is PR #299 that addresses this, though appears to be blocked since June.

There is a 4.0.1 available, though since 4.x is only 7 days old at this point, maybe version 3.x > 3.0.0 is safer?