tethys v0.8.0

Binary incompatible changes:

• TokenIteratorProducer.fromReader now returns Either[ReaderError, TokenIterator] (#37)
• ClassTag instances was removed from all json readers (#36)
• ReaderError.wrongType function was removed (#36)
• JsonReader. defaultValue and JsonReader.withDefaultValue was removed (#36)
• ReaderError became final class instead of sealed trait (#36)
• JsonReaderBuilderN.addField now accepts implicit instance of JsonReaderDefaultValue (#36)

New features:

• Add ability to alter json field names in macro derivation (#16, #36) see new syntax in test
• Add ability to make strict json parsing (#38) see new syntax in JsonReaderBuilderTest and SemiautoReaderDerivationTest
• describe block is no longer required for macro builders (#18)

Bug fixes:

• Fix problem with extraction field from field with the same name (#17) see this example
• Exception could be thrown by jsonAs if string is started from incorrect character (#37)