Merge commit 'c11b80a38f7706a7138c68c567ec7691b3009327'

* commit 'c11b80a38f7706a7138c68c567ec7691b3009327':
  new events were added
  Updated for the new release

README.md

@@ -4,11 +4,20 @@
 
 Download the latest sdk version from our server:
 
-[<img src=https://www.gameofwhales.com/sites/default/files/documentation/download.png>](https://github.com/Game-of-whales/GOW-SDK-IOS/releases/download/v2.0.20/gameofwhales.zip)
+[<img src=https://www.gameofwhales.com/sites/default/files/documentation/download.png>](https://github.com/Game-of-whales/GOW-SDK-IOS/releases/download/v2.0.21/gameofwhales.zip)
 
 # Changelog
 
 
+### 2.0.21 (Dec 17, 2018)
+
+FIXED
+
+* The handling of errors was improved.
+* The selection of advertising (cross-promotion) images depending on the orientation of the device was fixed.
+* The repeating of cross-promotion ads after some minutes was fixed.
+
+
 ### 2.0.20 (Nov 20, 2018)
 
 ADDED
@@ -189,6 +198,10 @@ Add the following methods:
  {
  }
 
+ func futureSpecialOfferAppeared(_ specialOffer: GWSpecialOffer) 
+ {
+ }
+
  func onPushDelivered(_ offer:GWSpecialOffer?, camp: String, title:String, message:String)
  {
  }
@@ -453,6 +466,11 @@ Add the following methods:
 
 }
 
+- (void)futureSpecialOfferAppeared:(nonnull GWSpecialOffer *)specialOffer
+{
+
+}
+
 - (void)onPushDelivered:(nullable GWSpecialOffer*) offer camp:(nonnull NSString *)camp title:(nonnull NSString*)title message:(nonnull NSString*)message
 {