Add ability to select distance unit

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 0.5.0+1
+version: 0.5.1+1
 
 environment:
   sdk: ^3.8.1
@@ -103,6 +103,6 @@ flutter_launcher_icons:
   android: true
   ios: true
   image_path: assets/icons/app_icon.png
-  adaptive_icon_background: "#ffffff"
+  adaptive_icon_background: "#000000"
   adaptive_icon_foreground: assets/icons/app_icon.png
   min_sdk_android: 21