Changed master to main in the links.

.github/CONTRIBUTING.md

@@ -28,7 +28,7 @@
 
 #### **Running tests and Debugging**
 
-* Expected test output is pulled in as a submodule from the [ImageSharp.Tests.Images repository](https://github.com/SixLabors/Imagesharp.Tests.Images/tree/master/ReferenceOutput). To succesfully run tests, make sure that you have updated the submodules!
+* Expected test output is pulled in as a submodule from the [ImageSharp.Tests.Images repository](https://github.com/SixLabors/Imagesharp.Tests.Images/tree/main/ReferenceOutput). To succesfully run tests, make sure that you have updated the submodules!
 * Debugging (running tests in Debug mode) is only supported on .NET Core 2.1+, because of JIT Code Generation bugs like [dotnet/coreclr#16443](https://github.com/dotnet/coreclr/issues/16443) or [dotnet/coreclr#20657](https://github.com/dotnet/coreclr/issues/20657)
 
 #### **Do you have questions about consuming the library or the source code?**

README.md

@@ -1,6 +1,6 @@
 <h1 align="center">
 
-<img src="https://github.com/SixLabors/Branding/raw/master/icons/imagesharp/sixlabors.imagesharp.svg?sanitize=true" alt="SixLabors.ImageSharp" width="256"/>
+<img src="https://github.com/SixLabors/Branding/raw/main/icons/imagesharp/sixlabors.imagesharp.svg?sanitize=true" alt="SixLabors.ImageSharp" width="256"/>
 <br/>
 SixLabors.ImageSharp
 </h1>
@@ -39,12 +39,12 @@ Support the efforts of the development of the Six Labors projects.
 ## Documentation
 
 - [Detailed documentation](https://sixlabors.github.io/docs/) for the ImageSharp API is available. This includes additional conceptual documentation to help you get started.
-- Our [Samples Repository](https://github.com/SixLabors/Samples/tree/master/ImageSharp) is also available containing buildable code samples demonstrating common activities.
+- Our [Samples Repository](https://github.com/SixLabors/Samples/tree/main/ImageSharp) is also available containing buildable code samples demonstrating common activities.
 
 ## Questions
 
 - Do you have questions? We are happy to help! Please [join our Discussions Forum](https://github.com/SixLabors/ImageSharp/discussions/category_choices), or ask them on [Stack Overflow](https://stackoverflow.com) using the `ImageSharp` tag. Please do not open issues for questions.
-- Please read our [Contribution Guide](https://github.com/SixLabors/ImageSharp/blob/master/.github/CONTRIBUTING.md) before opening issues or pull requests!
+- Please read our [Contribution Guide](https://github.com/SixLabors/ImageSharp/blob/main/.github/CONTRIBUTING.md) before opening issues or pull requests!
 
 ## Code of Conduct  
 This project has adopted the code of conduct defined by the [Contributor Covenant](https://contributor-covenant.org/) to clarify expected behavior in our community.

tests/ImageSharp.Tests/Formats/Jpg/Utils/LibJpegTools.cs

@@ -56,7 +56,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
         /// Executes 'dump-jpeg-coeffs.exe' for the given jpeg image file, saving the libjpeg spectral data into 'destFile'. Windows only!
         /// See:
         /// <see>
-        ///     <cref>https://github.com/SixLabors/Imagesharp.Tests.Images/blob/master/tools/jpeg/README.md</cref>
+        ///     <cref>https://github.com/SixLabors/Imagesharp.Tests.Images/blob/main/tools/jpeg/README.md</cref>
         /// </see>
         /// </summary>
         public static void RunDumpJpegCoeffsTool(string sourceFile, string destFile)
@@ -83,7 +83,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg.Utils
         /// <summary>
         /// Extract libjpeg <see cref="SpectralData"/> from the given jpg file with  'dump-jpeg-coeffs.exe'. Windows only!
         /// See:
-        /// https://github.com/SixLabors/Imagesharp.Tests.Images/blob/master/tools/jpeg/README.md
+        /// https://github.com/SixLabors/Imagesharp.Tests.Images/blob/main/tools/jpeg/README.md
         /// </summary>
         public static SpectralData ExtractSpectralData(string inputFile)
         {

tests/Images/External/README.md

@@ -5,4 +5,4 @@ Contains images to validate against in ImageSharp tests. In most cases the file
 Various utilities to help dealing with images.
 - `optipng.exe`: [lossless PNG compressor](http://optipng.sourceforge.net/), to keep the `ReferenceImages` folder as small as possible
 - `optimize-all.cmd`: Runs lossless optimizer for reference PNG-s. Currently it has to be manually edited to add new test class directories.
-- [`dump-jpeg-coeffs.exe`](https://github.com/SixLabors/Imagesharp/blob/master/tests/Images/External/tools/jpeg/README.md)
+- [`dump-jpeg-coeffs.exe`](https://github.com/SixLabors/Imagesharp/blob/main/tests/Images/External/tools/jpeg/README.md)