chore: remove first character of Github release

Github releases standard is in "v1.2.3" format, while image tags are in "1.2.3" formats.
When we query Github for the latest tag, strip it of the first character ("v").

Author: Shesekino

.travis.yml

@@ -52,7 +52,8 @@ jobs:
 ######################## MERGE TO MASTER ########################
     - stage: Publish
       if: branch = master AND type = push
-      script: LATEST_TAG=`git describe --abbrev=0 --tags ${TRAVIS_COMMIT}` &&
+      script: LATEST_TAG_WITH_V=`git describe --abbrev=0 --tags ${TRAVIS_COMMIT}` &&
+              LATEST_TAG=${LATEST_TAG_WITH_V:1} &&
               IMAGE_NAME_APPROVED=snyk/kubernetes-monitor:${LATEST_TAG}-approved &&
               IMAGE_NAME_PUBLISHED=snyk/kubernetes-monitor:${LATEST_TAG} &&
               docker login --username ${DOCKERHUB_USER} --password ${DOCKERHUB_PASSWORD} &&