Fix typespec and don't log warning if no matching locale was found

[adriankumpf]

This MR …

• fixes the typespec of Cldr.AcceptLanguage.best_match/2
• fixes a typo in the documentation of Cldr.Plug.SetSession
• and changes Cldr.Plug.AcceptLanguage to not log a warning if no matching locale was found

If the latter is not desired, I would suggest making the log level configurable so that the user of this library can decide whether errors are logged.

[kipcole9]

Thanks very much for the PR. My thinking behind logging the "no match" is primarily that if there is a community of users consistently requesting a locale that is not supported then the app team might consider implementing that locale. For that reason I would prefer a configurable log level to that reducing the noise to zero is also an option.

[kipcole9]

I've published ex_cldr version 2.22.0 with the following changelog entry:

Soft deprecation

• The plug Cldr.Plug.SetSession was introduced in ex_cldr version 2.21.0. However the convention in Phoenix and Plug is put, not set. The plug is renamed to Cldr.Plug.PutSession. Cldr.Plug.SetSession is still available but will emit a deprecation notice and will delegatge to Cldr.Plug.PutSession. Apologies to all for the sloppy release review process.

Bug Fixes

• Fix typespec of Cldr.AcceptLanguage.best_match/2. Thanks to @adriankumpf.

Enhancements

• Make log level for "no match" errors in Cldr.Plug.AcceptLanguage configurable.

Revised Plug.Cldr.AcceptLanguage Options

* `:cldr_backend` is any backend module. The default
  is `Cldr.default_backend/0`. If no `:cldr_backend`
  option is provided and no default backend is configured
  then an exception will be raised.

* `:no_match_log_level` determines the logging level for
  the case when no matching locale is configured to meet the users
  request. The default is `:warn`. If set to `nil` then no logging
  is performed.

[adriankumpf]

Thanks!