Ensure filename and class names match

Author: CronofyMatt

src/Cronofy/CronofyAccountClient.cs

@@ -571,7 +571,7 @@ public AvailabilityRule GetAvailabilityRule(string availabilityRuleId)
             request.Url = string.Format(this.UrlProvider.AvailabilityRuleUrl, availabilityRuleId);
             request.AddOAuthAuthorization(this.AccessToken);
 
-            var response = this.HttpClient.GetJsonResponse<GetAvailabilityRulesResponse>(request);
+            var response = this.HttpClient.GetJsonResponse<GetAvailabilityRuleResponse>(request);
 
             return response.AvailabilityRule.ToAvailabilityRule();
         }
@@ -602,7 +602,7 @@ public AvailabilityRule UpsertAvailabilityRule(UpsertAvailabilityRuleRequest ups
             request.AddOAuthAuthorization(this.AccessToken);
             request.SetJsonBody(upsertAvailabilityRuleRequest);
 
-            var response = this.HttpClient.GetJsonResponse<UpsertAvailabilityRulesResponse>(request);
+            var response = this.HttpClient.GetJsonResponse<UpsertAvailabilityRuleResponse>(request);
 
             return response.AvailabilityRule.ToAvailabilityRule();
         }

src/Cronofy/Responses/GetAvailabilityRuleResponse.cs

@@ -7,7 +7,7 @@ namespace Cronofy.Responses
     /// <summary>
     /// Class for the deserialization of a get availability rule response.
     /// </summary>
-    internal sealed class GetAvailabilityRulesResponse
+    internal sealed class GetAvailabilityRuleResponse
     {
         /// <summary>
         /// Gets or sets the availability rule.

src/Cronofy/Responses/UpsertAvailabilityRuleResponse.cs

@@ -7,7 +7,7 @@ namespace Cronofy.Responses
     /// <summary>
     /// Class for the deserialization of an upsert availability rules response.
     /// </summary>
-    internal sealed class UpsertAvailabilityRulesResponse
+    internal sealed class UpsertAvailabilityRuleResponse
     {
         /// <summary>
         /// Gets or sets the created or updated availability rule.