Merge pull request nervosnetwork#158 from nervosnetwork/add-before-ha…

…ndle

feat: add before handle

Merge pull request nervosnetwork#111 from nervosnetwork/add-function-…

…to-sessionid

chore: add function to session id

Merge pull request nervosnetwork#110 from nervosnetwork/release-0.2-a…

…lpha.2

chore: release 0.2-alpha.2

Merge pull request nervosnetwork#72 from nervosnetwork/update-identif…

…y-metadata

Update identify protocol metadata