Add support to Java 16. You can now do a partial mock for default methods.

Change log

• Update Objenesis to 3.2 (#269)
• Easymock 4.2 fails with Java 16 (Unsupported class file major version 60) (#268)
• Update asm to 9.1 (#267)
• Allow partial mocking for interfaces with default methods (#264)
• be more generic about jq install (#257)
• Easymock throws java.lang.OutOfMemoryError: Java heap space trying to output large array (10MB+) (#255)
• Serve easymock.org over HTTPS (#220)