Update to lru v0.10.0

Author: benesch

Cargo.toml

@@ -20,7 +20,7 @@ futures-core = "0.3"
 futures-util = "0.3"
 futures-sink = "0.3"
 lazy_static = "1"
-lru = "0.8.1"
+lru = "0.10.0"
 mio = { version = "0.8.0", features = ["os-poll", "net"] }
 mysql_common = { version = "0.29.2", default-features = false }
 once_cell = "1.7.2"