Fixed the regex for removing MSTest descriptions (#55)

Thanks! Fixes #54

Author: thomasbruggink

src/SpecFlow.NetCore/Fixer.cs

@@ -117,7 +117,7 @@ private void FixTests(DirectoryInfo directory)
 
 		private static string FixMsTest(string content)
 		{
-			content = Regex.Replace(content, ".*Microsoft.VisualStudio.TestTools.UnitTesting.Description.*", "");
+			content = Regex.Replace(content, @"\[Microsoft\.VisualStudio\.TestTools\.UnitTesting\.Description.*?\)]", "", RegexOptions.Singleline);
 			return content;
 		}