Please require the Numeric after NumericSecond for scope visibility

[mensfeld]

Hey there,

First of all, thank you for this amazing gem.

We have one problem related to our edge-case of working with Bundler Whenever and a background thread.

Due to the fact, that numeric.rb patches the Numeric, it expects the visibility of the NumericSeconds. What that means is, that in a rare case where you would have code running prior to loading whenever and you would require whenever, you end up with the following exception:

uninitialized constant Whenever

Would you be so kind (I can do it) and swap the loading order of those two classes?

ref https://github.com/javan/whenever/blob/master/lib/whenever.rb#L1
ref https://github.com/javan/whenever/blob/master/lib/whenever/numeric.rb#L3

repro (you need to start it couple of times and wait as it takes Ruby a while to jump with the require in between those executions and sometimes it will just hang forever):

Thread.new do
  while true
    begin
      1.respond_to?(:elo)
      sleep 0.00001
    rescue => e
      p e
    end
  end
end

sleep 0.1

require 'whenever'

end effect:

#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>
#<NameError: uninitialized constant Whenever>