update readme

README.md

@@ -238,7 +238,7 @@ AppleHealthKit.getBiologicalSex(null, (err: Object, res: Object) => {
     if(this._handleHealthKitError(err, 'getBiologicalSex')){
         return;
     }
-	// res.value will be one of the values from the above table (Value column) ...
+	// res.value will be one of the values from the above table (Value column)
     // use res.value ...
 });
 ```
@@ -248,7 +248,7 @@ ___
 #### **`getDateOfBirth`**
 Get the date of birth.
 
-On success, the callback function will be provided with a `res` object containing dob `value` (ISO timestamp), and `age` in years:
+On success, the callback function will be provided with a `res` object containing dob `value: string` (ISO timestamp), and `age: number` in years:
 ```javascript
 { 
 	value: '1986-09-01T00:00:00.000-0400',