v1.9.0

Adds a --summary-file output option. This prints a text-format summary of your project to a file, in this format:

@flow 35 (92.11%)
@flow strict 2 (5.26%)
@flow strict-local 1 (2.63%)
@flow weak 0 (0%)
no flow 0 (0%)
Total Files 38

The summary ignores any filters that are normally applied to the list output. The summary is also included in other output files such as --csv-file or --html-file when combined with --show-summary option.

Also updates dependencies.