Template generation fails due to requiring Ruby 2.4.0

[chrisballinger]

https://github.com/Raizlabs/ios-template/blob/c1740fc99bb540c252a3a97347160d74c0773eef/PRODUCTNAME/.ruby-version#L1

Initialized empty Git repository in /path/to/template/.git/
rbenv: version `ruby-2.4' is not installed (set by /path/to/template/.ruby-version)
ERROR: Stopping generation because post_gen_project hook script didn't exit successfully
Hook script failed (exit status: 1)