Log Message:
mail/ruby-mime-types-data: update to 3.2018.0812

## 3.2018.0812 / 2018-08-12

*   Added `.xsd` extension to `text/xml`. [#10][]

*   Added `.js` and `.mjs` extensions to `text/ecmascript` and
    `text/javascript`. [#11][]

*   Added `.ipa` extension to `application/octet-stream`. [#12][]

*   Moved extensions `.markdown` and `.md` and added `.mkd` extension to
    `text/markdown`. [#13][]

*   Because of a bug found with mime-types 3 before 3.2.1, this version
    requires mime-types 3.1 or later to manage data.

*   Updated the IANA media registry entries as of release date. The biggest
    major change here is the addition of the `font/` top-level media type.

*   MIME type changes not introduced by pull requests will no longer be
    individually tracked.

*   Clarified that the YAML editable format is not shipped with the Ruby gem
    for size considerations.