Incorrect CK_VERSION string value

[AlexSynakh]

Hi, it seems that CK_VERSION.ToString method is returning incorrect value.

I'm currently using Pkcs11Interop 5.1.2 library and it is returning FirmwareVersion = 7.2 instead of FirmwareVersion = 7.02.
According to PKCS#11 v2.40 section 3.1, minor version number is the hundredth portion of the version. Provided example in PKCS#11 specification shows that CK_VERSION { major = 2, minor = 1 } is 2.01 version

So, in order to correctly display version string, CK_VERSION.ToString method implementation should be something like this:

public override string ToString()
{
    if (Minor[0] == 0) 
    {
        return string.Format("{0}.{1}", Major[0], Minor[0]);
    }

    return string.Format("{0}.{1:D2}", Major[0], Minor[0]);
}