Merge pull request #222 from torokati44/hashbrown-0.16

Update hashbrown to 0.16

Author: jeromefroe

Cargo.toml

@@ -17,7 +17,7 @@ default = ["hashbrown"]
 nightly = ["hashbrown", "hashbrown/nightly"]
 
 [dependencies]
-hashbrown = { version = "0.15.2", optional = true }
+hashbrown = { version = "0.16.0", optional = true }
 
 [dev-dependencies]
 scoped_threadpool = "0.1.*"