Release share v0.22.0 (2021-01-06)

===  Breaking changes

* contact: remove unused package proofn

* sql: change the new client function parameter into struct of options.

===  New features

* cmd: add new CLI "totp"
+
The totp is a program to generate Time-based One-time Password from
secret key.

* totp: add method to generate n number of passwords

===  Enhancements

* http: print client request if debug value is equal or greater than 2.
+
If user set DEBUG environment variable or debug.Value to 2 or greater,
the http Client will print the request (header and body) to the
standard output.

* ssh: print the private key file that has an error when generating
  signers