Update Travis-CI status badge to .com from .org

Change-Id: I77091d541d81463b33731fc9b1a2971ce2e8a1f8

README.md

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-[![Build Status](https://travis-ci.org/ceres-solver/ceres-solver.svg?branch=master)](https://travis-ci.org/ceres-solver/ceres-solver)
+[![Build Status](https://app.travis-ci.com/ceres-solver/ceres-solver.svg?branch=master)](https://app.travis-ci.com/ceres-solver/ceres-solver)
 
 Ceres Solver
 ============