Add android-only getAPILevel method

Had to bump the method table by a few spaces as well... sorry

RNDeviceInfo/RNDeviceInfo.m

@@ -187,6 +187,7 @@ RCT_EXPORT_MODULE()
     return @{
              @"systemName": currentDevice.systemName,
              @"systemVersion": currentDevice.systemVersion,
+             @"apiLevel": @"not available",
              @"model": self.deviceName,
              @"brand": @"Apple",
              @"deviceId": self.deviceId,

android/src/main/java/com/learnium/RNDeviceInfo/RNDeviceModule.java

@@ -121,6 +121,7 @@ public class RNDeviceModule extends ReactContextBaseJavaModule {
     constants.put("model", Build.MODEL);
     constants.put("brand", Build.BRAND);
     constants.put("deviceId", Build.BOARD);
+    constants.put("apiLevel", Build.VERSION.SDK_INT);
     constants.put("deviceLocale", this.getCurrentLanguage());
     constants.put("deviceCountry", this.getCurrentCountry());
     constants.put("uniqueId", Secure.getString(this.reactContext.getContentResolver(), Secure.ANDROID_ID));

deviceinfo.js

@@ -29,6 +29,9 @@ module.exports = {
   getSystemVersion: function () {
     return RNDeviceInfo.systemVersion;
   },
+  getAPILevel: function () {
+    return RNDeviceInfo.apiLevel;
+  },
   getBundleId: function() {
     return RNDeviceInfo.bundleId;
   },

windows/RNDeviceInfo/RNDeviceInfoModule.cs

@@ -99,6 +99,7 @@ namespace RNDeviceInfo
                 constants["deviceName"] = deviceName;
                 constants["systemName"] = "Windows";
                 constants["systemVersion"] = osVersion;
+                constants["apiLevel"] = "not available";
                 constants["model"] = model;
                 constants["brand"] = model;
                 constants["deviceId"] = hardwareVersion;