chore(fetch/jvn): logging when invalid CVE-ID is found

[MaineK00n]

What did you implement:

Logging when a invalid CVEID is found.

refs. #233

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

$ go-cve-dictionary fetch jvn
...
WARN[12-28|12:04:14] Failed to get CVE-ID. Invalid CVE-ID: CCVE-2021-20208 
INFO[12-28|12:04:14] Inserting fetched CVEs(2021)... 
5544 / 5544 [-------------------------------------------------] 100.00% 2876 p/s
INFO[12-28|12:04:17] Refreshed 5544 CVEs. 
INFO[12-28|12:04:17] Finished fetching JVN.

Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES

Reference

[kotakanbe]

LGTM