v1.1.1 Minor fixes

bump version

v1.1.0 Enum conversion

• EnumConversion class

1.0.0 Json-schema generation and breaking changes

• JSON schema generation in compound objects via .schema() method;
• Conversion interface now requires .schema() method returning a JSON schema;
• moved functionality of ObjWithAliases to Obj;
• added possibility of storing undefined JSON fields in a model instance;
• validated class decorator checking the correctness of a Obj and Arr subclass;
• datetime_timestamp_conv to store a datetime as POSIX timestamp float.

Better exception info

In 0.4.0 NvelopeError is thrown if something goes wrong. NvelopeError contains path to the exact field that caused the error.

Recursive definitions fix

Better support for string type annotations