Fix version back too 1.2.0. (#542)

Author: jjliu15

packages/google_mobile_ads/CHANGELOG.md

@@ -1,13 +1,11 @@
-## 1.2.1
+## 1.2.0
 * Set new minimum height for `FluidAdWidget`.
   This is required after Flutter v2.11.0-0.1.pre because Android platform views
   that have no size don't load.
 * Update GMA Android dependency to 20.6.0 and iOS to 8.13.0.
   * [Android release notes](https://developers.google.com/admob/android/rel-notes)
   * [iOS release notes](https://developers.google.com/admob/ios/rel-notes)
 * Deprecate `AdapterResponseInfo.credentials` in favor of `adUnitMapping`
-
-## 1.2.0
 * Deprecates `LocationParams` in `AdRequest` and `AdManagerAdRequest`.
 
 ## 1.1.0

packages/google_mobile_ads/android/src/main/java/io/flutter/plugins/googlemobileads/Constants.java

@@ -17,7 +17,7 @@
 /** Constants used in the plugin. */
 public class Constants {
   /** Version request agent. Should be bumped alongside plugin versions. */
-  public static final String REQUEST_AGENT_PREFIX_VERSIONED = "Flutter-GMA-1.2.1";
+  public static final String REQUEST_AGENT_PREFIX_VERSIONED = "Flutter-GMA-1.2.0";
 
   static final String ERROR_CODE_UNEXPECTED_AD_TYPE = "unexpected_ad_type";
 }

packages/google_mobile_ads/ios/Classes/FLTConstants.h

@@ -13,4 +13,4 @@
 // limitations under the License.
 
 /** Versioned request agent string. */
-#define FLT_REQUEST_AGENT_VERSIONED @"Flutter-GMA-1.2.1"
+#define FLT_REQUEST_AGENT_VERSIONED @"Flutter-GMA-1.2.0"

packages/google_mobile_ads/pubspec.yaml

@@ -16,7 +16,7 @@ name: google_mobile_ads
 description: Flutter plugin for Google Mobile Ads, supporting
   banner, interstitial (full-screen),  rewarded and native ads
 homepage: https://github.com/googleads/googleads-mobile-flutter/tree/master/packages/google_mobile_ads
-version: 1.2.1
+version: 1.2.0
 
 flutter:
   plugin: