Update Composer dependencies (2018-11-02)

```
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 3 updates, 0 removals
  - Updating composer/spdx-licenses (1.4.0 => 1.5.0): Downloading (100%)
  - Updating composer/composer (1.7.2 => 1.7.3): Downloading (100%)
Writing lock file
Generating autoload files
PHP CodeSniffer Config installed_paths set to ../../phpcompatibility/php-compatibility/,../../wp-coding-standards/wpcs/,../../phpcompatibility/phpcompatibility-wp/
```

Author: wp-make-coffee