updated README.md and issue templates, added...

updated README.md and issue templates, added WebStorage.getInstance().deleteAllData() to clearAllCache on Android

.github/ISSUE_TEMPLATE/BUG_REPORT.md

@@ -6,10 +6,12 @@ about: Something is crashing or not working as intended
 
 ## Environment
 
+**Flutter version:** 
 **Plugin version:**  <!-- Add branch if necessary -->  
 **Android version:**  <!-- If customize ROM, write which -->  
+**iOS version:**
+**Xcode version:**  
 **Device information:**  <!-- Manufacturer and model -->  
-**Flutter version:**  <!-- Flutter version used -->  
 
 ## Description
 

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

@@ -6,8 +6,11 @@ about: Suggest an idea for this project
 
 ## Environment
 
-**App version:**  <!-- Add branch if necessary -->  
+**Flutter version:** 
+**Plugin version:**  <!-- Add branch if necessary -->  
 **Android version:**  <!-- If customize ROM, write which -->  
+**iOS version:**
+**Xcode version:**  
 **Device information:**  <!-- Manufacturer and model -->  
 
 ## Description

README.md

@@ -16,9 +16,11 @@ A Flutter plugin that allows you to add an inline webview or open an in-app brow
 - Android: `minSdkVersion 17`
 - iOS: `--ios-language swift`, Xcode version `>= 11`
 
-### Note for Android
+### IMPORTANT Note for Android
 
-During the build, if Android fails with `Error: uses-sdk:minSdkVersion 16 cannot be smaller than version 17 declared in library`, it means that you need to update the `minSdkVersion` of your `build.gradle` file to at least `17`. 
+During the build, if Android fails with `Error: uses-sdk:minSdkVersion 16 cannot be smaller than version 17 declared in library`, it means that you need to update the `minSdkVersion` of your `android/app/build.gradle` file to at least `17`.
+
+Also, you need to add `<uses-permission android:name="android.permission.INTERNET"/>` in the `android/app/src/main/AndroidManifest.xml` file in order to give minimum permission to perform network operations in your application. 
 
 Because of [Flutter AndroidX compatibility](https://flutter.dev/docs/development/packages-and-plugins/androidx-compatibility), the latest version that doesn't use `AndroidX` is `0.6.0`.
 

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebView/InAppWebView.java

@@ -16,6 +16,7 @@ import android.webkit.ValueCallback;
 import android.webkit.WebBackForwardList;
 import android.webkit.WebHistoryItem;
 import android.webkit.WebSettings;
+import android.webkit.WebStorage;
 
 import com.pichillilorenzo.flutter_inappwebview.ContentBlocker.ContentBlocker;
 import com.pichillilorenzo.flutter_inappwebview.ContentBlocker.ContentBlockerAction;
@@ -854,6 +855,7 @@ final public class InAppWebView extends InputAwareWebView {
     clearCache(true);
     clearCookies();
     clearFormData();
+    WebStorage.getInstance().deleteAllData();
   }
 
   public void takeScreenshot(final MethodChannel.Result result) {