[webview_flutter] Fix the version update for #2533 (#2711)

diff --git a/packages/webview_flutter/CHANGELOG.md b/packages/webview_flutter/CHANGELOG.md
index 85e59f2..36dc43f 100644
--- a/packages/webview_flutter/CHANGELOG.md
+++ b/packages/webview_flutter/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.3.20+3
+## 0.3.21
 
 * Enable programmatic scrolling using Android's WebView.scrollTo & iOS WKWebView.scrollView.contentOffset.
 
diff --git a/packages/webview_flutter/pubspec.yaml b/packages/webview_flutter/pubspec.yaml
index a258f0b..26e4fbc 100644
--- a/packages/webview_flutter/pubspec.yaml
+++ b/packages/webview_flutter/pubspec.yaml
@@ -1,6 +1,6 @@
 name: webview_flutter
 description: A Flutter plugin that provides a WebView widget on Android and iOS.
-version: 0.3.20+3
+version: 0.3.21
 homepage: https://github.com/flutter/plugins/tree/master/packages/webview_flutter
 
 environment: