Log Message:
Update capistrano to 3.8.2.

## `3.8.2` (2017-06-16)

https://github.com/capistrano/capistrano/compare/v3.8.1...v3.8.2

### Breaking changes:

* None

### Other changes:

* [#1882](https://github.com/capistrano/capistrano/pull/1882): Explain where to \ 
add new Capfile lines in scm deprecation warning - \ 
[@robd](https://github.com/robd)