Use semantic linebreaks; mention dependencies

[Semantic Linebreaks](http://rhodesmill.org/brandon/2012/one-sentence-per-line/) allow better reading and editing of code, and more readable diffs.
minor change: add spaces after commas
Merge pull request #7 from waldir/patch-1

Use semantic linebreaks in README; mention dependencies; add spaces after commas
Bugfix. ``response.json`` is should be a method.
Merge pull request #8 from exhuma/master

In the latest request package, response.json is a method, not a field.