Version 0.2.0

Here's whats new in 0.2.0:

We've upgraded to more current versions of our crate's dependencies

• actix-rt to 1.1
• actix-web to 2.0
• actix-service to 1.0
• base64 to 0.12
• futures to 0.3
• json to 0.12
• rayon to 1.3