fix some warnings

[dx7]

Running specs before the changes with RUBYOPT=-w:

Ruby Warnings resolved:

 162 lib/httpi/request.rb:108: warning: instance variable @on_body not initialized
 147 lib/httpi/request.rb:59: warning: instance variable @ssl not initialized
 100 lib/httpi/response.rb:53: warning: instance variable @body not initialized
  40 lib/httpi/auth/ssl.rb:66: warning: instance variable @ssl_version not initialized
   1 spec/httpi/auth/ssl_spec.rb:6: warning: ambiguous first argument; put parentheses or a space even after `/' operator
   1 spec/httpi/adapter/curb_spec.rb:261: warning: ambiguous first argument; put parentheses or a space even after `/' operator
   1 spec/httpi/adapter/curb_spec.rb:260: warning: ambiguous first argument; put parentheses or a space even after `/' operator
   1 lib/httpi/response.rb:47: warning: instance variable @body not initialized
   1 lib/httpi/auth/ssl.rb:13: warning: ambiguous first argument; put parentheses or a space even after `/' operator
   1 lib/httpi.rb:106: warning: instance variable @query_builder not initialized

[rogerleite]

Hi @dx7! Thanks for this PR.

I don't know why, Travis is not happy and is failing, i need to look for what is breaking it.

Thanks again, i'll merge this soon.

[dx7]

👍

[dx7]

Thanks for the merge.

[rogerleite]

👍 v2.4.2 released! Thanks!