Remove phf dependency

Author: Luni-4

Cargo.lock

@@ -20,7 +20,6 @@ num = "^0.4"
 num-derive = "^0.3"
 num-traits = "^0.2"
 petgraph = "^0.6"
-phf = { version = "^0.10", features = ["macros"] }
 regex = "^1.5"
 serde = { version = "^1.0", features = ["derive"] }
 termcolor = "^1.1"