zim-tools 3.6.0 (new formula)

[adamlamar]

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zim-tools contains utilities for working with zim files. Uses the existing formula libzim.

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>?
• Is your test running fine brew test <formula>?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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docopt and mustache dependencies, install steps. zim-tools installs well and the utilities appear to work as expected on my local system.

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