v1.3.0 contains minor changes and enhancements. All users should be safe to upgrade.

Functional changes

• Added GenerateOpts.Rand to control the random source for generating secrets https://github.com/pquerna/otp/pull/45
• Parse the Period of an OTP URL https://github.com/pquerna/otp/pull/49

Documentation changes

• Note that SHA1 should be used for compatibility with Google Authenticator https://github.com/pquerna/otp/pull/57
• Expanded Example https://github.com/pquerna/otp/pull/53