don't use forward slashes in sed when string has forward slashes

.travis.yml

@@ -14,7 +14,7 @@ script:
 - PACKAGE_NAME=`echo $TRAVIS_REPO_SLUG | sed 's/.*\///g'`
 - PACKAGE_REV=`echo $TRAVIS_COMMIT | sed -e 's/^[[:alnum:]]\{6\}/&-/g' | sed 's/-.*//'`
 - PAYLOAD=`( cat ./slack_payload.json)`
-- PAYLOAD_PARSE=$(echo $PAYLOAD | sed -e "s/\$PACKAGE_NAME/$PACKAGE_NAME/g" -e "s/\$PACKAGE_REV/$PACKAGE_REV/g" -e "s/\$TRAVIS_REPO_SLUG/$TRAVIS_REPO_SLUG/g" -e "s/\$TRAVIS_BUILD_NUMBER/$TRAVIS_BUILD_NUMBER/g" -e "s/\$PACKAGE_REV/$PACKAGE_REV/g")
+- PAYLOAD_PARSE=$(echo $PAYLOAD | sed -e "s/\$PACKAGE_NAME/$PACKAGE_NAME/g" -e "s/\$PACKAGE_REV/$PACKAGE_REV/g" -e "s:\$TRAVIS_REPO_SLUG:$TRAVIS_REPO_SLUG:g" -e "s/\$TRAVIS_BUILD_NUMBER/$TRAVIS_BUILD_NUMBER/g" -e "s/\$PACKAGE_REV/$PACKAGE_REV/g")
 - mkdir $PACKAGE_NAME
 - if [ -e *.json ]; then cp *.json $PACKAGE_NAME; fi
 - if [ -e *.md ]; then cp *.json $PACKAGE_NAME; fi

slack_payload.json

@@ -3,7 +3,7 @@
 	"icon_url":"https://a.slack-edge.com/0180/img/services/travis_48.png",
 	"attachments": [
 		{
-			"pretext": "Build # <https://travis-ci.com/$TRAVIS_REPO_SLUG/$TRAVIS_JOB_ID|$TRAVIS_BUILD_NUMBER> ($PACKAGE_REV) of $TRAVIS_REPO_SLUG",
+			"pretext": "Build # <https://travis-ci.com/'$TRAVIS_REPO_SLUG'/$TRAVIS_JOB_ID|$TRAVIS_BUILD_NUMBER> ($PACKAGE_REV) of $TRAVIS_REPO_SLUG",
 			"color": "good",
 			"text":"<https://s3-us-west-2.amazonaws.com/cycling74-ci/$PACKAGE_NAME/$PACKAGE_NAME-$PACKAGE_REV.zip>"
 		}