feature: BrowserStack also supports camel case for the capability rea…

[sinstein]

…l_mobile

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[sinstein]

I signed it!

[googlebot]

CLAs look good, thanks!

[sinstein]

@dignifiedquire there seems to be no activity on this project for a while. Who should I get in touch with to get this PR merged?

[dignifiedquire]

can you add this to the docs as well please?

[vedharish]

@dignifiedquire @sinstein
Sending camel case realMobile in caps is supported after #129.

Have updated the PR with just README changes.