Add raw_json=1 to fix HTML entity encodings #83

https://www.reddit.com/dev/api#response_body_encoding

Thought it was a reddit bug, extra info here: https://www.reddit.com/r/bugs/comments/cyz8x1
But turns out its intended behavior. Currently this library doesn't do anything to fix the HTML entities so it should either use raw_json=1 or HTML decode string values (probably the former is better)