Update README.md

Author: styropyr0

README.md

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 The Unity Mask Map Generator is a C# desktop application designed to streamline the process of creating mask maps for Unity HDRP projects. This tool allows developers to easily combine different texture maps into a single mask map, optimizing their materials and improving rendering performance.
 
 ## Features
-- Import and combine texture maps: Roughness, Ambient Occlusion, Detail, and Smoothness.
+- Import and combine texture maps: Metallic, Ambient Occlusion, Detail, and Smoothness.
 - User-friendly interface with clear options and an intuitive workflow.
 - "Invert" checkboxes for each texture map to provide additional control over the output.
 - Efficient generation of mask maps with a single click.