* Used to have 6 functions: MarshalOnePayload, MarshalOnePayloadWithoutIncluded, MarshalOne, MarshalManyPayload, MarshalManyPayloadWithoutIncluded, MarshalMany - now there are only 3: MarshalPayload, MarshalPayloadWithoutIncluded, Marshal. This simplifies the public API; will be easier to explain and document while still providing the existing support for struct ptrs (&Blog{}) and slices of struct ptrs ([]*Blog{}).
* Correcting all code occurrences leftover.
* Updating README to reflect Marshal API changes.
* Omit the mention of One vs Many