fix travis badge
fix travis badge

Signed-off-by: dmitriy kalinin <0638f5af938d97bf839390c6283ef9e40c331b8e@pivotallabs.com>

pivotal-golang/s3cli,TestingCI/s3cli-submodule-test,pivotal-golang/s3cli,pivotal-golang/s3cli,TestingCI/s3cli-submodule-test,pivotal-golang/s3cli