Update Composer dependencies (2017-10-18)
Update Composer dependencies (2017-10-18)

```
Loading composer repositories with package information
Updating dependencies
Package operations: 0 installs, 1 update, 0 removals
  - Updating symfony/polyfill-mbstring (v1.5.0 => v1.6.0):  Checking out 2ec8b39c38
Writing lock file
Generating autoload files
```

2ndkauboy/wp-cli,rodrigoprimo/wp-cli,gitlost/wp-cli,2ndkauboy/wp-cli,GaryJones/wp-cli,aaemnnosttv/wp-cli,GaryJones/wp-cli,gitlost/wp-cli,GaryJones/wp-cli,trepmal/wp-cli,rodrigoprimo/wp-cli,aaemnnosttv/wp-cli,rodrigoprimo/wp-cli,aaemnnosttv/wp-cli,2ndkauboy/wp-cli,trepmal/wp-cli,trepmal/wp-cli,gitlost/wp-cli