Bump version and dependencies

Bump version and dependencies

Correct regex matches

Fix #23

Set `http.WriteTimeout` as 4x the user-specific timeout (to handle bu…

…lk requests)

Cleanup Scalar API docs

Use semicolons to divide scan result errors, not commas

Supply advice despite non-fatal errors

Return a 400 error for single invalid domain API requests
Clarify why DKIM may be missing
Add `s1` and `s2` to our known DKIM selectors
Don't return an error for NXDOMAIN DNS requests, as these are expected from some requests (e.g. trying to find the correct DKIM selector)

Replace unmaintained caching library with local generic implementation

Log API requests
Support JSON logs (`--prettyLog=false`)
Update GitHub Actions

Parallelize DNS record lookups

Support using TCP or TCP with TLS for DNS queries
Fix incorrect logger injection for the scanner
Increase default DNS buffer from `1024` to `4096`
Strip unneeded information from release builds