Fix typo

(cherry picked from commit 7e03bce1)

README.md

@@ -88,7 +88,7 @@ in the documentation for more information.
 GLFW itself depends only on the headers and libraries for your window system.
 
 The (experimental) Wayland backend also depends on the `extra-cmake-modules`
-package, which is used to generated Wayland protocol headers.
+package, which is used to generate Wayland protocol headers.
 
 The examples and test programs depend on a number of tiny libraries.  These are
 located in the `deps/` directory.