undefined: time.UnixMilli and lib/ocsp.go:151:17: undefined: io.ReadAll

[TayyabIkhlaq]

When i ran installation command "go install github.com/square/certigo" into my ubuntu terminal inside certigo directory ,it gives below errors.

github.com/square/certigo/lib
lib/ct.go:32:25: undefined: time.UnixMilli
lib/ocsp.go:151:17: undefined: io.ReadAll

There is no information to resolve this error on google.Please guide how can i resolve this error ?

[jdtw]

What version of Go are you using (go version)?

[TayyabIkhlaq]

It is go 1.13.

[TayyabIkhlaq]

Now i upgrade it to go 1.19,but still get no results.When i type certigo i didn't recognize it.

[TayyabIkhlaq]

What version of Go are you using (go version)?

It is go 1.19 now,previously go 1.13 also checked but not worked.