fix(fetch/inthewild): change gorm type

[MaineK00n]

What did you implement:

Fixes #114

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

before

$ docker run --name postgres --rm -e POSTGRES_PASSWORD=postgres -p 5432:5432 -d postgres
$ go-exploitdb fetch inthewild --dbtype postgres --dbpath "host=localhost user=postgres dbname=postgres sslmode=disable password=postgres"
INFO[02-20|01:51:59] Fetching inTheWild Poc Exploit 
INFO[02-20|01:52:01] inTheWild Poc Exploit                    count=84170
INFO[02-20|01:52:01] Insert Exploit into go-exploitdb.        db=postgres
INFO[02-20|01:52:01] Inserting 84170 Exploits 
INFO[02-20|01:52:01] Inserting new Exploits 
10000 / 84170 [------>____________________________________________] 11.88% ? p/sFailed to insert. dbpath: host=localhost user=postgres dbname=postgres sslmode=disable password=postgres, err: Failed to insert. err: ERROR: value too long for type character varying(255) (SQLSTATE 22001)

after

$ docker run --name postgres --rm -e POSTGRES_PASSWORD=postgres -p 5432:5432 -d postgres
$ go-exploitdb fetch inthewild --dbtype postgres --dbpath "host=localhost user=postgres dbname=postgres sslmode=disable password=postgres"
INFO[02-20|01:53:16] Fetching inTheWild Poc Exploit 
INFO[02-20|01:53:18] inTheWild Poc Exploit                    count=84170
INFO[02-20|01:53:18] Insert Exploit into go-exploitdb.        db=postgres
INFO[02-20|01:53:18] Inserting 84170 Exploits 
INFO[02-20|01:53:18] Inserting new Exploits 
84170 / 84170 [----------------------------------------------] 100.00% 50697 p/s
INFO[02-20|01:53:20] No CveID Exploit Count                   count=0
INFO[02-20|01:53:20] CveID Exploit Count                      count=84170

Checklist:

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

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

Is this ready for review?: YES

Reference