IPv4 check not works correctly

[muneale]

Hi everyone,
I'm facing the following issue while using your library.

isIPv4('123.123.123.');  // --> false | OK because I expect false
isIPv4('123.123.123.1');  // --> true | OK because I expect true
isIPv4('123.123.123.12');  // --> true | OK because I expect true
isIPv4('123.123.123.123');  // --> true | OK because I expect true
isIPv4('123.123.123.1234');  // --> true | NOT OK because I expect false and I get true
isIPv4('123.123.123.12345');  // --> true | NOT OK because I expect false and I get true

I'm using the 5.0.0 version and I'm using Typescript.