Fix getting started link from README (#1065)
Fix getting started link from README (#1065)

Summary:
Fix https://github.com/facebook/flipper/issues/1064.
Pull Request resolved: https://github.com/facebook/flipper/pull/1065

Test Plan: eyes

Reviewed By: jknoxville

Differential Revision: D21257849

Pulled By: passy

fbshipit-source-id: 9e973b8eceef66b9ceaaba1c326b07c92817316d

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