Rename prost-derive.rs

This follows Cargo conventions. Cargo recently began warning when the convention is not followed: rust-lang/cargo#4259.
tokio-rs · Jul 16, 2017 · 6962a3b · 6962a3b
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commit 6962a3b
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diff --git a/prost-derive/src/prost-derive.rs → prost-derive/src/lib.rs b/prost-derive/src/prost-derive.rs → prost-derive/src/lib.rs