release 1.1.0

Have been tested with
* OpenResty 1.17.8 + OpenSSL 1.1.1
* OpenResty 1.15.8 + OpenSSL 1.0.2

prepare to release 1.0.2

bump version 1.0.1

change: switch to semver

release v0.05

style: tweak code style.

doc: use SHA256 instead of SHA1 in the example.

first release