Updated serializers to current versions (27-01-2020).

[pkok]

That means that the updated versions are now:

• thrift 0.13.0
• protobuf 3.11.2
• boost 1.72.0
• msgpack 3.1.1
• cereal 1.3.1
• avro 1.9.1
• capnproto 0.7.0
• flatbuffers 1.11.0
• YAS 7.0.5

Only msgpack and capnproto did not have updates.

The benchmark is (again) performed on my system, which has slightly different specs from the original author's. This is also reflected in the README.md. Graphs are updated to reflect these results.