Flag "-e" is not supported in the "docker login" command anymore.

Author: diemol

.travis.yml

@@ -18,11 +18,11 @@ script:
 # only push up tags
 after_success:
   - if [ "$TRAVIS_TAG" != "" ]; then
-    docker login -e="$DOCKER_EMAIL" -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
+    docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
     VERSION="$TRAVIS_TAG" make release;
     fi
   - if [[ "$TRAVIS_TAG" == "$LATEST"* ]]; then
-    docker login -e="$DOCKER_EMAIL" -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
+    docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
     VERSION="$TRAVIS_TAG" make tag_latest;
     VERSION="latest" make release_latest;
     fi