change documentation regarding default branch

Update CHANGELOG (micromdm#658)

update changelog

deps update

Updated CHANGELOG (round 2: metadata) (micromdm#501)

pin to aes_fix branch (micromdm#454)

Resolves micromdm#453

This is a temporary fix until the proper CBC variant for content encryption is implemented in pkcs7

dependency update

Update everything to latest and cleans up unused dependencies.

user management

reset used io.Reader for pkg upload (micromdm#209)

update readme