fix HK unit bpm

RCTAppleHealthKit/RCTAppleHealthKit+Methods_Vitals.m

@@ -8,8 +8,11 @@
 - (void)vitals_getHeartRateSamples:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback
 {
     HKQuantityType *heartRateType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierHeartRate];
+    
+    HKUnit *count = [HKUnit countUnit];
+    HKUnit *minute = [HKUnit minuteUnit];
 
-    HKUnit *unit = [RCTAppleHealthKit hkUnitFromOptions:input key:@"unit" withDefault:[HKUnit countUnit]];
+    HKUnit *unit = [RCTAppleHealthKit hkUnitFromOptions:input key:@"unit" withDefault:[count unitDividedByUnit:minute]];
     NSUInteger limit = [RCTAppleHealthKit uintFromOptions:input key:@"limit" withDefault:HKObjectQueryNoLimit];
     BOOL ascending = [RCTAppleHealthKit boolFromOptions:input key:@"ascending" withDefault:false];
     NSDate *startDate = [RCTAppleHealthKit dateFromOptions:input key:@"startDate" withDefault:nil];