fix for face-id authentication on bolusing (#710)

Author: Kdisimone

Loop/Info.plist

@@ -50,6 +50,8 @@ Glucose data from the Health database is used for graphing and momentum calculat
 	<key>NSHealthUpdateUsageDescription</key>
 	<string>Carbohydrate meal data entered in the app and on the watch is stored in the Health database.
 Glucose data retrieved from the CGM is stored securely in HealthKit.</string>
+	<key>NSFaceIDUsageDescription</key>
+	<string>Face ID is used to authenticate insulin boluses.</string>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>bluetooth-central</string>