0.1.6

Various fixes & improvements

• support const keyword (#27) by @6293
• include input values in snapshot for a smooth review (#28) by @6293
• chore: consistent return type among methods (#29) by @6293
• split testsuite into files (#24) by @6293
• split multiple types into anyOf subschema (#20) by @6293
• feat: Add support for changes to "required" properties (#19) by @lynnagara
• doc: Remove feature list from README (#18) by @untitaker