chore: fix travis/deploy.sh with explicit dockerhub user.

Author: C-nit

.travis/deploy.sh

@@ -1,6 +1,6 @@
  #!/bin/sh
 
 echo ${DOCKER_PASSWORD} | docker login -u ${DOCKER_USERNAME} --password-stdin
-docker tag ${DOCKER_USERNAME}/mimkl:latest ${DOCKER_USERNAME}/mimkl:${TRAVIS_COMMIT}
-docker push ${DOCKER_USERNAME}/mimkl:${TRAVIS_COMMIT}
-docker push ${DOCKER_USERNAME}/mimkl:latest
+docker tag tsenit/mimkl:latest tsenit/mimkl:${TRAVIS_COMMIT}
+docker push tsenit/mimkl:${TRAVIS_COMMIT}
+docker push tsenit/mimkl:latest