add cupertino icons to fix warning

Author: clangenb

app/pubspec.lock

@@ -305,6 +305,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      sha256: ba631d1c7f7bef6b729a622b7b752645a2d076dba9976925b8f25725a30e1ee6
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.8"
   dart_geohash:
     dependency: "direct main"
     description:

app/pubspec.yaml

@@ -25,6 +25,7 @@ environment:
 dependencies:
   collection: ^1.18.0
   convert: ^3.1.1
+  cupertino_icons: ^1.0.8
   latlong2: ^0.9.0
   # intl - format numbers
   intl: ^0.18.1