Also ensure we keep track of previous docker image tags. Refs #4371
@@ -1,6 +1,6 @@
DOKKU_VERSION ?= master
DOCKER_IMAGE_LABELER_VERSION ?= 0.2.0
DOCKER_IMAGE_LABELER_VERSION ?= 0.2.2
HEROKUISH_VERSION ?= 0.5.19
PLUGN_VERSION ?= 0.6.1
PROCFILE_VERSION ?= 0.11.0
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