Fixed typo

INSTALL

@@ -14,4 +14,4 @@ https://assimp-docs.readthedocs.io/en/latest/
 Building Assimp 
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-Just check the build-instaructions which you can find here: https://github.com/assimp/assimp/blob/master/Build.md
+Just check the build-instructions which you can find here: https://github.com/assimp/assimp/blob/master/Build.md