v0.6.0-nullsafety.2

• Breaking asList*() methods now ignore null values. The map function now receives a RequiredPick as fist parameter instead of a Pick making parsing easier.

  Therefore pick().required().asList((RequiredPick pick) => /*...*/) only maps non-nullable values. When your lists contain null it will be ignored.
  This is fine in most cases and simplifies the map function.

  In rare cases, where your lists contain null values with meaning, use the second parameter whenNull to map those null values .asList((pick) => Person.fromPick(pick), whenNull: (Pick it) => null). The function still receives a Pick which gives access to the context api or the PickLocation. But the Pick never holds any value.

• Breaking Don't parse doubles as int because the is no rounding method which satisfies all #31

• Breaking Allow parsing of "german" doubles with , as decimal separator #30

• Improve error messages with more details where parsing stopped

• New RequiredPick.nullable() converting a RequiredPick back to a Pick with potential null value

• New PickLocation.followablePath. While PickLocation.path contains the full path to the value, followablePath contains only the part which could be followed with a non-nullable value