Detect trailing spaces in *.robot files

[php-coder]

A couple of times I've merged PRs and I've noticed trailing spaces in the *.robot files too late. We need to detect such violations and fail earlier.

rflint should support it, but it doesn't: boakley/robotframework-lint#37

So, here what we can do:

• contribute such a support to rflint
• write a custom rule for rflint
• add a simple check to Danger (it could be just a single grep invocation)

[php-coder]

A couple of times I've merged PRs

Here is the commits where I had to fix trailing spaces:

• 3672a31
• da0ba7e
• ea7d9c3

As I see, we need to detect this not only for *.robot files but also for HTML content.

[php-coder]

One more: faf5474

[php-coder]

Yet another one: 5d78e2b

[mukeshk]

I will double-check on next commits.

[php-coder]

@mukeshk I don't blame you as it should be spotted by our scripts. I also haven't noticed it during review so this is something that just should be automated.

[php-coder]

One more: f62ebd2