message: Remove invalid claim that Protocol Buffers does not support unions
  Protocol Buffers v3 supports the `oneof` operator:
diff: @@ -64,8 +64,8 @@ Protocol Buffers is indeed relatively similar to FlatBuffers,
  with the primary difference being that FlatBuffers does not need a parsing/
  unpacking step to a secondary representation before you can
  access data, often coupled with per-object memory allocation. The code
  -is an order of magnitude bigger, too. Protocol Buffers has neither optional
  -text import/export nor schema language features like unions.
  +is an order of magnitude bigger, too. Protocol Buffers has no optional
  +text import/export.
  ### But all the cool kids use JSON!
  