fix commit sha for travis

.travis.yml

@@ -17,7 +17,7 @@ env:
 script:
   # build and unit test
   - echo "==> build and unit test pumba"
-  - docker build -t pumba/build-and-test --target build-and-test --build-arg CODECOV_TOKEN=${CODECOV_TOKEN} --build-arg VCS_COMMIT_ID=${TRAVIS_COMMIT:0:7} --build-arg VCS_BRANCH_NAME=${TRAVIS_BRANCH} -f docker/Dockerfile .
+  - docker build -t pumba/build-and-test --target build-and-test --build-arg CODECOV_TOKEN=${CODECOV_TOKEN} --build-arg VCS_COMMIT_ID=${TRAVIS_COMMIT} --build-arg VCS_BRANCH_NAME=${TRAVIS_BRANCH} -f docker/Dockerfile .
   # copy pumba binary and run integration tests
   - docker create --name pumba --rm -e CI_BUILD_ID=${TRAVIS_BUILD_ID} -e CI_BUILD_URL=${TRAVIS_BUILD_WEB_URL} pumba/build-and-test
   - docker cp pumba:/go/src/github.com/alexei-led/pumba/.bin/pumba .