Updates documentation and github URL references to community versions

• Support Swift 5

• Update tools-version to 4.2 (fixes compile warning) #22

• Fix Hashable compilation warning (#20)

• Enable handling of types that require validation (#13)
  • Introduces two new protocols, to enable types that validate their values to be inspected by the TypeDecoder: ValidSingleCodingValueProvider and ValidKeyedCodingValueProvider. See the README for more details.
  • Decoding errors that occur during type decoding will now be thrown as a TypeDecodingError. You may log or inspect this error to determine why decoding failed.

• TypeInfo now conforms to CustomDebugStringConvertible to provide a more succinct debugDescription suitable for use in a debugging context (#12)

• Update to Swift 4.1.2
• OrderedDictionary subscript to extract value from position

Initial release of typedecoder