Updated bat config dir for MacOs

Removed directories crate and using dirs_rs
Changed bat config file and cache dir on MacOs:
config: ~/.config/bat/config
cache: ~/.config/bat/cache/

Cargo.toml

@@ -19,7 +19,7 @@ atty = "0.2.2"
 ansi_term = "0.11"
 ansi_colours = "^1.0"
 console = "0.7"
-directories = "1.0"
+dirs = "1.0"
 lazy_static = "1.2"
 wild = "2.0"
 content_inspector = "0.2.4"