Require linked-hash-map v0.5.3 (or a newer patch version)

This commit requires linked-hash-map to include contain-rs/linked-hash-map#100

When linked-hash-map is on v0.5.2, ttl_cache can panic due to the UB checks implemented in Rust 1.48: rust-lang/rust#66151

Author: austinjones

Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["cache","ttl","expire"]
 license = "MIT/Apache-2.0"
 
 [dependencies]
-linked-hash-map = "0.5"
+linked-hash-map = "~0.5.3"
 
 
 [features]