v0.7

Changelog

• 6170308 - Fix: Flatten any instances of {type: { type: ... } }
• 3cd6051 Bump version to 0.7
• 5714441 Feature / breaking change: add preserve_non_string_maps and change … (#3)
• 4dab99a Fix: Union types are now flattened (i.e. if a union has a type which is another union, they will be combined). (#4)