v0.5.0

• Conservative grouping of declarations. Tidy will automatically insert newlines in declaration contexts. At the top-level, the grouping is a little smarter, but in let declarations it only inserts newlines before signatures.
• Add extra 2-space alignment with single character operators, so they look and align like delimiters. Normal indentation is used for longer operators.
• Fixes alignment of multiline monotypes in signatures when using arrow-first.