Remove unused binary feature from root crate

The binary benchmark was moved to a different crate, in the 'binary'
subdirectory.

Author: dtolnay

Cargo.toml

@@ -11,7 +11,6 @@ jemallocator = "0.5"
 json = { version = "0.12", optional = true }
 rustc-serialize = { version = "0.3", optional = true }
 serde = { version = "1.0", features = ["derive"], optional = true }
-serde-bench = { version = "0.0.7", optional = true }
 serde_json = { version = "1.0", optional = true }
 simd-json = { version = "0.5", optional = true}
 time = "0.3"
@@ -33,7 +32,6 @@ stringify-dom = []
 parse-struct = []
 stringify-struct = []
 zero-copy = []
-binary = ["serde-bench", "lib-serde"]
 
 [profile.release]
 debug = true