readme: Fix build instructions (wrong protobuf version) #438
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Travis uses Protobuf 3.2.0 for testing, but the readme specifies Protobuf 2.5.0.
The project fails to build with 2.5.0:
The issue is very easy to reproduce with my Dockerfile -- gg7/docker-parquet-mr (note that you have to change the protobuf URL in addition to specifying
--build-arg PROTOBUF_VERSION=2.5.0
due to protocolbuffers/protobuf#2025 ).