fix json renderer

src/render/json.zig

@@ -16,7 +16,7 @@ pub fn render(allocator: std.mem.Allocator, weather: types.WeatherData) ![]const
         .weather = weather.forecast,
     };
 
-    return try std.fmt.allocPrint(allocator, "{any}", .{std.json.fmt(data, .{})});
+    return try std.fmt.allocPrint(allocator, "{f}", .{std.json.fmt(data, .{})});
 }
 
 test "render json format" {