Update ruby-simplecov to 0.10.0.

0.10.0 2015-04-18 (changes)

Enhancements

* Add writeup about using with Spring to README. See #341 (thanks @swrobel
  and @onebree)
* Add support to pass in an Array when creating filter groups (original PR
  #104)
* Filter /vendor/bundle by default. See #331 (thanks @andyw8)
* Add some helpful singleton methods to the version string.
* Allow array to be passed in a filter. See 375 (thanks @JanStevens)
* Enforce consistent code formatting with RuboCop.

Bugfixes

* Fix order dependencies in unit tests. See #376 (thanks @hugopeixoto)
* Only run the at_exit behaviors if the current PID matches the PID that
  called SimpleCov.start. See #377 (thanks @coderanger)

(taca)