[ci] Fix github releases script

Author: adangel

.travis/build.sh

@@ -27,7 +27,7 @@ elif [ "${TRAVIS_REPO_SLUG}" = "pmd/pmd-eclipse-plugin" ] && [ "${TRAVIS_PULL_RE
         log_info "This is a release build for tag ${TRAVIS_TAG} (version: ${VERSION})"
 
         # create a draft github release
-        gh_releases_createDraftRelease "${TRAVIS_TAG}" "$(git show-ref --hash ${TRAVIS_TAG})"
+        gh_releases_createDraftRelease "${TRAVIS_TAG}" "$(git rev-list -n 1 ${TRAVIS_TAG})"
         GH_RELEASE="$RESULT"
 
         # Deploy the update site to bintray

.travis/github-releases-api.sh

@@ -31,7 +31,7 @@ EOF
     )
 
     log_debug "POST https://api.github.com/repos/pmd/pmd-eclipse-plugin/releases"
-    log_info "Creating gihtub draft release"
+    log_info "Creating github draft release"
     RESULT=$(curl --fail -s -H "Authorization: token ${GITHUB_OAUTH_TOKEN}" \
                 -H "Content-Type: application/json" \
                 -X POST \