Multiple space in code will also become subject of squish

Thank you for a wonderful library.

There is one thing in trouble. It is a little inconvenient to squish multiple spaces.
It is good to make one space before and after a line break. But, if possible, I do not want squish the space in the code. Please consider.

https://github.com/javan/whenever/blob/21ce00be97bb3c1c58994b6debb776e8259a303e/lib/whenever/job.rb#L44

Steps to reproduce

every 1.hour do
  runner "p '  '"
end

Expected behavior

0 * * * * /bin/bash -l -c 'cd /path/to/myapp && bin/rails runner -e production '\''p '\''\'\'''\''  '\''\'\'''\'''\'' >> log/cron.log'

Actual behavior

0 * * * * /bin/bash -l -c 'cd /path/to/myapp && bin/rails runner -e production '\''p '\''\'\'''\'' '\''\'\'''\'''\'' >> log/cron.log'

Multiple spaces are now one.

System configuration

whenever version: 0.10.0
Ruby version: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]

Start at lib/whenever/job.rb around the linked line and reproduce the issue with the Ruby runner example from the report. Compare the generated crontab output with the expected output, then verify that multiple spaces inside the command remain intact while spacing around line breaks still behaves as intended.