Add a Changes file.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Bump version to 0.002.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Require Math::BigInt 1.78.

Earlier version do not have the try import.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>