feat: video-reward uses test devices

in js we have to send in our config a key with:

```
{
  testDevices: ['someId', 'someOtherId']
}
```

as per admob test devices config: https://developers.google.com/admob/android/test-ads#enable_test_devices

chore: up plugin version

chore: update docs

Author: distante

README.md

@@ -134,6 +134,24 @@ While the Ionic community have provided [an Ionic Native Plugin](https://ionicfr
 
 As I ([@ratson](https://github.com/ratson)) don't use Ionic myself, it would be great if some experienced Ionic developers could help answering questions or come up with more examples. HELP WANTED HERE.
 
+## FAQ
+
+### My video rewards are not working on test mode (Android).
+
+You need to set your tests devices array. [AdMob official](https://developers.google.com/admob/android/test-ads#enable_test_devices) says:
+
+In LogCat search for:
+```
+I/Ads: Use AdRequest.Builder.addTestDevice("33BE2250B43518CCDA7DE426D04EE231")
+to get test ads on this device."
+```
+`33BE2250B43518CCDA7DE426D04EE231` is your device id send it with your video reward config in this way:
+```
+config = {
+  testDevices: ['33BE2250B43518CCDA7DE426D04EE231']
+}
+```
+
 ## Credits
 
 Thanks for the [cordova-plugin-admob-simple](https://github.com/sunnycupertino/cordova-plugin-admob-simple) author for forking the original project [cordova-plugin-admob](https://github.com/floatinghotpot/cordova-plugin-admob) to [make it functional](https://github.com/sunnycupertino/cordova-plugin-admob-simple/issues/1) and open source it.

plugin.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <plugin xmlns:android="http://schemas.android.com/apk/res/android" id="cordova-plugin-admob-free"
-    version="0.27.0" xmlns="http://apache.org/cordova/ns/plugins/1.0">
+    version="0.27.1" xmlns="http://apache.org/cordova/ns/plugins/1.0">
     <name>Cordova AdMob Plugin</name>
     <description>Robust, reliable and easy to use Cordova Admob plugin for Android and iOS
         phone. Allows preloading and automatic loading of interstitials and banners plus more.

src/android/rewardvideo/RewardVideoExecutor.java

@@ -49,16 +49,28 @@ public void run() {
                 Log.w("rewardedvideo", plugin.config.getRewardedVideoAdUnitId());
 
                 synchronized (rewardedVideoLock) {
-                    if (!isRewardedVideoLoading) {
-                        isRewardedVideoLoading = true;
-                        Bundle extras = new Bundle();
-                        extras.putBoolean("_noRefresh", true);
-                        AdRequest adRequest = new AdRequest.Builder()
-                                .addNetworkExtrasBundle(AdMobAdapter.class, extras)
-                                .build();
-                        rewardedVideoAd.loadAd(plugin.config.getRewardedVideoAdUnitId(), adRequest);
-                        delayCallback.success();
+                    if (isRewardedVideoLoading) {
+                        return;
                     }
+
+                    isRewardedVideoLoading = true;
+                    Bundle extras = new Bundle();
+                    extras.putBoolean("_noRefresh", true);
+
+                    final AdRequest.Builder adBuilder = new AdRequest.Builder()
+                    .addNetworkExtrasBundle(AdMobAdapter.class, extras);
+
+                    final List<String> testDevices = plugin.config.testDeviceList;
+                    if (testDevices != null && !testDevices.isEmpty()) {
+                        for (String deviceId : testDevices) {
+                            adBuilder.addTestDevice(deviceId);
+                        }
+                    }
+
+                    final AdRequest adRequest = adBuilder.build();
+
+                    rewardedVideoAd.loadAd(plugin.config.getRewardedVideoAdUnitId(), adRequest);
+                    delayCallback.success();
                 }
             }
         });