bump smallvec to 1.0.0

Author: tesuji

clippy_lints/Cargo.toml

@@ -26,7 +26,7 @@ pulldown-cmark = "0.6.0"
 quine-mc_cluskey = "0.2.2"
 regex-syntax = "0.6"
 serde = { version = "1.0", features = ["derive"] }
-smallvec = { version = "0.6.5", features = ["union"] }
+smallvec = { version = "1", features = ["union"] }
 toml = "0.5.3"
 unicode-normalization = "0.1"
 semver = "0.9.0"