Update security/erlang-fast_tls to 1.0.11.

- coveralls:convert_file is not 4 arg function
- Resolve vars.config relative to SCRIPT
- Comment debug line
- Fix a couple typos in the README's macOS/OS X section
- Small typo fix on readme
- Deprecate hash functions in favor of crypto:hash/2
- Fix certificate decoding to OTP format

(fhajny)