Test Hello World example in README

Author: thinkingserious

tests/SendGrid.Tests/Integration.cs

@@ -98,7 +98,7 @@ public void TestSendSingleEmailWithHelper()
 
             Console.WriteLine(msg.Serialize());
 
-            Assert.True(msg.Serialize() == "{\"from\":{\"name\":\"Example User\",\"email\":\"[email protected]\"},\"personalizations\":[{\"to\":[{\"name\":\"Example User\",\"email\":\"[email protected]\"}],\"subject\":\"Sending with SendGrid is Fun\"}],\"content\":[{\"type\":\"text/plain\",\"value\":\"and easy to do anywhere, even with C#\"},{\"type\":\"text/html\",\"value\":\"\u003cstrong\u003eand easy to do anywhere, even with C#\u003c/strong\u003e\"}]}");
+            Assert.True(msg.Serialize() == "{\"from\":{\"name\":\"Example User\",\"email\":\"[email protected]\"},\"personalizations\":[{\"to\":[{\"name\":\"Example User\",\"email\":\"[email protected]\"}],\"subject\":\"Sending with SendGrid is Fun\"}],\"content\":[{\"type\":\"text/plain\",\"value\":\"and easy to do anywhere, even with C#\"},{\"type\":\"text/html\",\"value\":\"<strong>and easy to do anywhere, even with C#<strong>\"}]}");
         }
 
         [Fact]