(EZ-101) Add README note about minimum TK version dep for restart-file
(EZ-101) Add README note about minimum TK version dep for restart-file

This commit adds a note to the README.md about the minimum TK version
which an app must use in order for services to be started successfully
by packages built using the new `restart-file` feature in TK.

puppetlabs/ezbake,puppetlabs/ezbake,puppetlabs/ezbake