builder/img: Add vim-tiny to heroku-18 image
builder/img: Add vim-tiny to heroku-18 image

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>

lmars/flynn,lmars/flynn,flynn/flynn,flynn/flynn,flynn/flynn,lmars/flynn,lmars/flynn,flynn/flynn,flynn/flynn,lmars/flynn