Added changelog entry

Allow header to remain JSON even if someone changes the payload seria…

…lizer

Fixed a bug that caused with custom digest methods and hmac key deriv…

…ation.

This is 0.16

This is 0.15

This is 0.14

This is 0.13

Fixed an issue with wrong timezones being used for EPOCH calculation.

This is 0.11

Bump to 0.10