chore: bump version (shelljs#429)

Merge pull request shelljs#338 from shelljs/release/v0.6.0

chore: release v0.6.0

version bump

bump ver

Merge pull request shelljs#179 from andreialecu/fix-rmrfwin32

Fix issue shelljs#49: Retry rmdirSync on Windows for up to 1 second if files still exist.

Bump version, update README for new make args

0.3.0

0.2.6

0.2.5

0.2.4