Bugfixes

• Workaround new YouTube blocks: "Sign in to confirm you are not a bot" and "This device or application is no longer supported" fixing #275. With credit to @ndgsa.

Other

• Pin and hash dependencies to protect against supply chain attacks.

Note for windows users: there are two releases. One release is for Windows Vista, Windows 7, or 32-bit systems only, and does not include the latest Python security patches. All other windows users should use the other release which contains the latest security patches for Python.