v0.9.3-beta.1

• Refactor signature header const to an enum to support multiple headers 2ac54db
• Ensure timestamp is a string when used for verifying signature c6901a5
• Add signature validation tests to every handler for integration testing ca985ce
• Add hidden flag to allow expired signatures during testing 66aa372
• Refactor key signing to RequestSignature class to separate functionality aefc20f
• Return better errors with a stack trace when a handler fails fa37702
• Always set _isProd when receiving handler actions 4e9e133
• Update handler tests to specify req.json for run tests 848b691
• Fix lint 86a4892
• Add tests asserting signature validation works as expected 69ce46d
• Update docs abdb07d
• Refactor handlers to add signatures 64b76ef

v0.9.2...v0.9.3-beta.1