Hi,

I got a build error with last commit 2b1fdbffcb595bcd72fa9aa3db674c6985042bcb,

error ("Version must be a string")
  error("Version must be a string")
  version-to-list(29.1)
  version<(29.1 "19.29")
  #f(compiled-function (e1 e2) #<bytecode 0x7353c27725409c8>)((29.1
ruby-mode) ("19.29" time-stamp))

This patch will fix the error. Please merge it, thanks.

Best regards
Lin