updated readme dependency and fixed android imports and build version typos

Author: wumke

README.md

@@ -29,7 +29,7 @@ Or manual: add the latest version as dependeny to your package.json.
   },
   "dependencies": {
     ...
-    "react-native-local-notifications": "0.1.0",
+    "react-native-local-notifications": "2.0.0",
     ...
   }
 ```

android/src/main/java/com/github/wumke/RNLocalNotifications/AlarmReceiver.java

@@ -2,6 +2,7 @@
 
 import android.app.Activity;
 import android.app.ActivityManager;
+import android.app.Notification;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;

android/src/main/java/com/github/wumke/RNLocalNotifications/RNLocalNotificationsModule.java

@@ -92,12 +92,12 @@ public void createAlarm(Integer id, String text, String datetime, String sound,
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { //API LVL 23, Android 6
                 alarmManager.setExactAndAllowWhileIdle (AlarmManager.RTC_WAKEUP, timeInMillis, mAlarmSender);
             }
-            else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.L) { //API LVL 21, Android 5
+            else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { //API LVL 21, Android 5
                 AlarmManager.AlarmClockInfo info = new AlarmManager.AlarmClockInfo(timeInMillis, mAlarmSender);
                 alarmManager.setAlarmClock (info, mAlarmSender);
 
             }
-            else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.K) { //API LVL 19, Android 4.4
+            else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { //API LVL 19, Android 4.4
                 alarmManager.setExact(AlarmManager.RTC_WAKEUP, timeInMillis, mAlarmSender);
             }
             else { //<19