macOS Support (#18)

* replace target_os = "linux" with target_family = "unix"

* check correct dir for macos steam files

src/steam/utils.rs

@@ -118,6 +118,18 @@ pub fn get_default_location() -> Result<String, Box<dyn Error>> {
                 .unwrap_or(""),
         )
     };
+    #[cfg(target_os = "macos")]
+    let path_string = {
+        let home = std::env::var("HOME")?;
+        String::from(
+            Path::new(&home)
+                .join("Library")
+                .join("Application Support")
+                .join("Steam")
+                .to_str()
+                .unwrap_or(""),
+        )
+    };
     Ok(path_string)
 }