readme: Downgrade protoc to 3.0.2 to match grpc-protobuf
Protobuf runtime 3.0.2 is included transitively via grpc-protobuf v1.0.3. Protoc doesn't have to match the version identically, but must not be newer than the runtime. We must wait until v1.1 release of grpc to bump protobuf version in the readme. Fixes #2578
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