Seeds work for the day they're made on

[nathanielks]

Thank you for adding a deterministic seed in #13! An issue I'm experiencing in https://github.com/humanmade/go-anonymize-mysqldump is the determinism seems to only last for a day. What I'm seeing is that whenever I go to work on the script a day or so later, the values generated are different than the ones generated a few days prior, even though the seed value hasn't changed. Any ideas?

[nathanielks]

For reference, I'm seeding in my test's init() function: https://github.com/humanmade/go-anonymize-mysqldump/blob/c691faa1acf4a2cea64c0dd99dfabe7394bab31e/anonymize-mysqldump_test.go#L41