Use q{} for _status_message so message can contain a single quote

[timbunce]

Fixes #3

[tmueller]

Thanks a lot for your submission. I merged your PR and HTTP::Exception was released just now with your additions :)

Although I could not recreate the issue you described in Issue #3, I kept your way of escaping the quote in "I'm a teapot" using q{}. I tried to sanitize the qoute with s/'/\'/ before, but obviously that didn't work and was not as ellegant as your solution.