Label component missing form-control-label class

[matthewheck]

Issue description

• version #4.6.2
• components: Label

Label appears to be missing the form-control-label class. I ran into this problem when handling validation issues.

Example of code

<FormGroup color={color}>
	<Label for={name}>{label}</Label>
	<Input .../>
	<FormText color="muted">{helpToDisplay}</FormText>
	<FormFeedback>{error}</FormFeedback>
</FormGroup>

Code output

<div class="has-danger form-group">
	<label for="first_name" class="">What is your name?</label>
	<input class="form-control" ...>
	<small class="form-text text-muted">Please include first name and last name.</small>
	<div class="form-control-feedback">There was a problem!</div>
</div>

Bootstrap Documentation

This is from the latest Bootstrap documentation

<div class="form-group has-danger">
  <label class="form-control-label" for="inputDanger1">Input with danger</label>
  <input type="text" class="form-control form-control-danger" id="inputDanger1">
  <div class="form-control-feedback">Sorry, that username's taken. Try another?</div>
  <small class="form-text text-muted">Example help text that remains unchanged.</small>
</div>

Solutions

Most painless solution is for me to just pass form-control-label as the className prop, but given that this is in the Bootstrap documentation, it seems that a more holistic solution could be preferable (which I'm happy to handle).

I believe the change will be pretty much a one liner, but will have to make sure the class is only added when the Label is not being used with a column prop or when the label is for checkboxes/radios to follow the examples from Bootstrap.

If you're okay with this addition, I'm happy to open up a PR!

[TheSharpieOne]

Looks like I missed that one. Yes, please make a PR (don't forget a test to ensure the class doesn't unintentionally disappear in the future). ❤️