Finish 3.2.2

many fix

Finish 3.2.1

重新发布 3.2.1
修复 auth_chain_f
-------------------
添加 auth_chain_e/f
添加 xchacha20 xsalsa20
修复内存泄漏

Note: xchacha20 xsalsa20 需要 libsodium 1.0.12 及以上版本支持

Finish 3.2.0

add auth_chain_c/d

bump

update readme

update CHANGES

fix duplicated close in LRUCache

close #324

release 2.6.8

update CHANGES

bump