Add failing React.memo test

[billyjanitsch]

Failing test to demonstrate #16.

Removing .failing from the test causes concordance to crash with this error:

  Error thrown in test:

  TypeError {
    message: 'Unexpected value with type 0xOBJECT',
  }

  encodeValue (node_modules/concordance/lib/encoder.js:91:9)
  encodeValue (node_modules/concordance/lib/encoder.js:86:13)
  Object.encode (node_modules/concordance/lib/encoder.js:240:31)
  serialize (node_modules/concordance/lib/serialize.js:232:18)
  useDeserialized (test/serialize-and-encode.js:15:18)