Fixed clan war info stage end time when null

Clan war info - stage end time thrown exception when it should be null. This is now fixed.

Version 0.7.2 -> 0.7.3

Co-Authored-By: richagain <richagain@users.noreply.github.com>

CR API Standart Wrapper/Clan/ClanWarInfo.cs

@@ -25,11 +25,11 @@ public class ClanWarInfo
         /// <summary>
         /// Unix timestamp, when current clan war stage ends
         /// </summary>
-        public int stageEndTime
+        public int? stageEndTime
         {
             get
             {
-                return _warEndTime ?? _collectionEndTime.Value;
+                return _warEndTime ?? _collectionEndTime.GetValueOrDefault();
             }
             set { }
         }

README.md

@@ -8,11 +8,11 @@ If it is there, but it isn't in wrapper, [create wrapper issue](https://github.c
 
 To start, you'll need AUTH key to access API. Go to [ROYALE API website](https://docs.royaleapi.com/#/authentication?id=key-management) and get your own key.
 
-Now just download nuget package [Stastny.CRAPI](https://www.nuget.org/packages/Stastny.CRAPI/) and everything is ready :)
+Now just download nuget package [Stastny.CRAPI](https://www.nuget.org/packages/Stastny.CRAPI/) and everything will be ready :)
 ```
-Install-Package Stastny.CRAPI -Version 0.7.2
+Install-Package Stastny.CRAPI -Version 0.7.3
 
-dotnet add package Stastny.CRAPI --version 0.7.2
+dotnet add package Stastny.CRAPI --version 0.7.3
 ```
 
 ## How to start