we don't need extra iVar for hash backed author
raise ArgumentError when has_one association was provided
fix typo in changelog

[ci skip]
adding documentation for f.association

Example of how to use :label_method and :value_method with f.association

closes #662
remove extra ERB characters

[ci skip]
add CONTRIBUTING guide
fix bad copy-paste :(

[ci skip]
Bump Gemfile.lock
Release the SimpleForm 2.0.3 :heart:
Now the horizon is 2.1.0
Check by the validation kind method instead of the full constant
label_input should return html_safe string
add test for this case
remove empty line after custom_wrapper_with_wrapped_label_input
Merge pull request #669 from allomov/html_safe_label_input

label_input should return html_safe string
use user object with name attribute to be consistent with other tests
update CHANGELOG

[ci skip]
Generates additional wrapper class based on object + attribute name,
like `<div class='input string user_name'>`.

Closes #576
Use `lookup_model_names` instead `object_name`.

https://github.com/plataformatec/simple_form/commit/b5f2ea420d5969a9f968cff97e5b894ce3ed0dae#commitcomment-1959017
Use a more restrictive glob for the tests files

Closes #673