Update version to 1.0.21 (#654)

Author: TalZaccai

.azure/pipelines/azure-pipelines-external-release.yml

@@ -3,7 +3,7 @@
 #      1) update the name: string below (line 6)     -- this is the version for the nuget package (e.g. 1.0.0)
 #      2) update \libs\host\GarnetServer.cs readonly string version  (~line 53)   -- NOTE - these two values need to be the same 
 ###################################### 
-name: 1.0.20
+name: 1.0.21
 trigger:
   branches:
     include:

libs/host/GarnetServer.cs

@@ -49,7 +49,7 @@ public class GarnetServer : IDisposable
         protected StoreWrapper storeWrapper;
 
         // IMPORTANT: Keep the version in sync with .azure\pipelines\azure-pipelines-external-release.yml line ~6.
-        readonly string version = "1.0.20";
+        readonly string version = "1.0.21";
 
         /// <summary>
         /// Resp protocol version