Update README.md

[allenwang-code]

Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html

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[allenwang-code]

signed!

[googlebot]

CLAs look good, thanks!

[mcanonic]

Hi, in the readme file for UiAutomator, you asked to enable "Android testing support library Repository". Are you sure that this is the correct name? Is this readme deprecated? I did not find any repository with that name.
Same problem with "Android Tests" asked later in the file, but maybe this is due to the missing repository above.
Thanks, M

[mrk-han]

@mcanonic Not sure that is relevant to this PR. Perhaps file a separate issue, or submit a PR to address those PR changes.