#283 Fixing broken build.

Author: vaptsarov

src/MyTested.AspNetCore.Mvc.Abstractions/Builders/Authentication/WithoutClaimsPrincipalBuilder.cs

@@ -31,6 +31,13 @@ public IAndWithoutClaimsPrincipalBuilder WithoutRole(string role)
             return this;
         }
 
+        public IAndWithoutClaimsPrincipalBuilder WithoutUsername(string username)
+        {
+            base.RemoveUsername(username);
+
+            return this;
+        }
+
         public IWithoutClaimsPrincipalBuilder AndAlso()
             => this;
     }