title: ImageSharp can't load Image (MethodNotFound)
body: <p>I have migrated my ImageSharp references to version 1.0.0-dev000692. Now I can't load an Image anymore. I'm getting the exception you can see down below.</p>
  
  <p><strong>Call</strong>:</p>
  
  <pre><code>byte[] data = GetImage();
  var image = Image.Load(data);
  </code></pre>
  
  <p>The function is called in a ASP.Net Core (2.0) application</p>
  
  <p><strong>Exception</strong>:</p>
  
  <pre><code>Method not found: '!0 System.ReadOnlySpan`1.get_Item(Int32)'.
  
  at SixLabors.ImageSharp.Formats.Bmp.BmpImageFormatDetector.IsSupportedFileFormat(ReadOnlySpan`1 header)
  at SixLabors.ImageSharp.Formats.Bmp.BmpImageFormatDetector.DetectFormat(ReadOnlySpan`1 header)
  at SixLabors.ImageSharp.Image.&lt;&gt;c__DisplayClass0_0.&lt;InternalDetectFormat&gt;b__0(IImageFormatDetector x)
  at System.Linq.Enumerable.SelectEnumerableIterator`2.MoveNext()
  at System.Linq.Enumerable.TryGetLast[TSource](IEnumerable`1 source, Func`2 predicate, Boolean&amp; found)
  at SixLabors.ImageSharp.Image.InternalDetectFormat(Stream stream, Configuration config)
  at SixLabors.ImageSharp.Image.Decode[TPixel](Stream stream, Configuration config)
  at SixLabors.ImageSharp.Image.WithSeekableStream[T](Stream stream, Func`2 action)
  at SixLabors.ImageSharp.Image.Load[TPixel](Configuration config, Stream stream, IImageFormat&amp; format)
  at SixLabors.ImageSharp.Image.Load[TPixel](Configuration config, Byte[] data)
  at work4all.Server.Api.Core.Controllers.FileController.ResizeBenutzerBild(Byte[] data, Int32 maxHeight, Int32 maxWidth, String filename) in D:\DEV\VSTS-work4all\work4all Server\work4all.Server.Api.Core\work4all.Server.Api.Core\Controllers\FileController.cs:line 211
  </code></pre>