v0.6.0 — `ensure_ascii`

• Include changelog in the Read the Docs site
• Support Python 3.8
• When dumping a value that begins with more than one space, only escape the first space in order to better match Java's behavior
• Gave dump(), dumps(), escape(), and join_key_value() an ensure_ascii parameter for optionally not escaping non-ASCII characters in output
• Gave dump() and dumps() an ensure_ascii_comments parameter for controlling what characters in the comments parameter are escaped
• Gave to_comment() an ensure_ascii parameter for controlling what characters are escaped
• Added a custom encoding error handler 'javapropertiesreplace' that encodes invalid characters as \uXXXX escape sequences