Orphan method removed

Author: VitaliyKurokhtin

src/Microsoft.OpenApi.Readers/OpenApiYamlDocumentReader.cs

@@ -2,8 +2,6 @@
 // Licensed under the MIT license. 
 
 using System;
-using System.IO;
-using System.Linq;
 using Microsoft.OpenApi.Exceptions;
 using Microsoft.OpenApi.Extensions;
 using Microsoft.OpenApi.Interfaces;
@@ -125,17 +123,5 @@ public T ReadFragment<T>(YamlDocument input, OpenApiSpecVersion version, out Ope
 
             return (T)element;
         }
-
-        /// <summary>
-        /// Helper method to turn streams into YamlDocument
-        /// </summary>
-        /// <param name="input">Stream containing YAML formatted text</param>
-        /// <returns>Instance of a YamlDocument</returns>
-        static YamlDocument LoadYamlDocument(TextReader input)
-        {
-            var yamlStream = new YamlStream();
-            yamlStream.Load(input);
-            return yamlStream.Documents.First();
-        }
     }
 }