chore: update license references

Author: Sam Harrison

README.md

@@ -2,7 +2,7 @@
 
 [![Travis Badge](https://travis-ci.org/sendgrid/csharp-http-client.svg?branch=main)](https://travis-ci.org/sendgrid/csharp-http-client)
 [![NuGet](https://img.shields.io/nuget/v/SendGrid.CSharp.Http.Client.svg)](https://www.nuget.org/packages/SendGrid.CSharp.HTTP.Client)
-[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.md)
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Twitter Follow](https://img.shields.io/twitter/follow/sendgrid.svg?style=social&label=Follow)](https://twitter.com/sendgrid)
 [![GitHub contributors](https://img.shields.io/github/contributors/sendgrid/csharp-http-client.svg)](https://github.com/sendgrid/csharp-http-client/graphs/contributors)
 
@@ -118,4 +118,4 @@ If you need help installing or using the library, please check the [Twilio SendG
 If you've instead found a bug in the library or would like new features added, go ahead and open issues or pull requests against this repo!
 
 # License
-[The MIT License (MIT)](LICENSE.md)
+[The MIT License (MIT)](LICENSE)

UnitTest/RequiredFilesExistTest.cs

@@ -57,9 +57,9 @@ public void checkIssuesTemplateExists() {
           Assert.True(File.Exists("./ISSUE_TEMPLATE.md"));
       }
 
-      // ./LICENSE.md
+      // ./LICENSE
       public void checkLicenseExists() {
-          Assert.True(File.Exists("./LICENSE.md"));
+          Assert.True(File.Exists("./LICENSE"));
       }
 
       // ./PULL_REQUEST_TEMPLATE.md

UnitTest/UnitTest.cs

@@ -30,7 +30,7 @@ public override Task<Response> MakeRequest(HttpClient client, HttpRequestMessage
                 response.StatusCode = HttpStatusCode.OK;
 
                 cancellationToken.ThrowIfCancellationRequested();
-                
+
                 return new Response(response.StatusCode, response.Content, response.Headers);
             }, cancellationToken);
         }
@@ -104,7 +104,7 @@ public class TestRepositoryFiles
         [Test]
         public void TestLicenseEndYear()
         {
-            var licensePath = Path.Combine("..", "..", "..", "LICENSE.md");
+            var licensePath = Path.Combine("..", "..", "..", "LICENSE");
             string line = File.ReadLines(licensePath).Skip(2).Take(1).First();
 
             Assert.AreEqual(DateTime.Now.Year.ToString(), line.Substring(14, 4));