devel/ruby-test-unit: update to 3.2.7

## 3.2.7 - 2017-12-12 {#version-3-2-7}

### Improvements

  * Added source code link to gemspec.
    [GitHub#157][Patch by Grey Baker]

  * Changed to use SVG image for badges in README.
    [GitHub#158][Patch by Olle Jonsson]

  * [UI][console]: Added `--reverse-output` option to output fault
    details in reverse like Ruby 2.5. It's enabled by default only for
    tty output.

### Fixes

  * Fixed a typo.
    [GitHub#156][Patch by masa kunikata]

  * [UI][console]: Fixed a bug that broken align in verbose mode.

### Thanks

  * masa kunikata

  * Grey Baker

  * Olle Jonsson

## 3.2.6 - 2017-09-21 {#version-3-2-6}

### Improvements

  * Changed test file require failure to error from omission.
    [GitHub#154][Patch by naofumi-fujii]

### Thanks

  * naofumi-fujii

(taca)