v3.0.0

async-session 3.0.0

• Merge pull request #15 from joshtriplett/disable-oldtime
  Disable the "oldtime" feature of chrono

• Upgrade base64, hmac, and rand to current versions
  This reduces duplicate crate versions in dependency trees that include
  async-session.

• drop dependency on async-std
  updates all dependencies, and documents the available stores in the readme

• document framework implementations as well

This change is major because one of the updated crypto reexports had a
breaking change

v2.0.1

bugfix:

#12 do not serialize the destroy field on Session

In addition to being an unnecessary use of storage, this presented an
issue with compiling async-session on arm architecture.