DEPRECATION WARNING: Calling `<<` to an ActiveModel::Errors message array in order to add an error is deprecated

[dannytip]

When using bootstrap_form > v5.1.0 with rails v6.1.7.4 i receive the following deprecation warning:

DEPRECATION WARNING: Calling <<to an ActiveModel::Errors message array in order to add an error is deprecated. Please callActiveModel::Errors#add instead.

I believe its coming from this line:

https://github.com/bootstrap-ruby/bootstrap_form/blob/main/lib/bootstrap_form/components/validation.rb#L74

[lcreid]

Thanks for taking the time to help us make this gem better. This is a good find. Are you interested in submitting a pull request to fix it?

[dannytip]

@lcreid i'll try take a look when i get a moment.

[dannytip]

PR: #690