WireMock.Net.FluentAssertions : upgrade to latest FluentAssertions (#635)

* .

* #634

* fix UT

src/WireMock.Net.FluentAssertions/Assertions/WireMockReceivedAssertions.cs

@@ -4,23 +4,39 @@ using WireMock.Server;
 // ReSharper disable once CheckNamespace
 namespace WireMock.FluentAssertions
 {
+    /// <summary>
+    /// Contains a number of methods to assert that the <see cref="IWireMockServer"/> is in the expected state.
+    /// </summary>
     public class WireMockReceivedAssertions : ReferenceTypeAssertions<IWireMockServer, WireMockReceivedAssertions>
     {
-        public WireMockReceivedAssertions(IWireMockServer server)
+        /// <summary>
+        /// Create a WireMockReceivedAssertions. 
+        /// </summary>
+        /// <param name="server">The <see cref="IWireMockServer"/>.</param>
+        public WireMockReceivedAssertions(IWireMockServer server) : base(server)
         {
-            Subject = server;
         }
-        
+
+        /// <summary>
+        /// Asserts if <see cref="IWireMockServer"/> has received a call.
+        /// </summary>
+        /// <returns><see cref="WireMockAssertions"/></returns>
         public WireMockAssertions HaveReceivedACall()
         {
             return new WireMockAssertions(Subject, null);
         }
-        
+
+        /// <summary>
+        /// Asserts if <see cref="IWireMockServer"/> has received n-calls.
+        /// </summary>
+        /// <param name="callsCount"></param>
+        /// <returns><see cref="WireMockAssertions"/></returns>
         public WireMockANumberOfCallsAssertions HaveReceived(int callsCount)
         {
             return new WireMockANumberOfCallsAssertions(Subject, callsCount);
         }
 
+        /// <inheritdoc/>
         protected override string Identifier => "wiremockserver";
     }
 }