Update README to indicate CMake build files are included

Author: jwmcglynn

README.md

@@ -22,7 +22,7 @@ std::vector<uint8_t> diffImage(img1.size());
 const int numDiffPixels = pixelmatch::pixelmatch(img1, img2, diffImage, width, height, stride, options);
 ```
 
-Compared to [mapbox/pixelmatch-cpp](https://github.com/mapbox/pixelmatch-cpp), pixelmatch-cpp17 ports the latest features from the JavaScript library, and is built with production-grade practices, including thorough test coverage and fuzz-testing.  Build files are included for Bazel, but contributions for other build systems are welcome.
+Compared to [mapbox/pixelmatch-cpp](https://github.com/mapbox/pixelmatch-cpp), pixelmatch-cpp17 ports the latest features from the JavaScript library, and is built with production-grade practices, including thorough test coverage and fuzz-testing.  Build files are included for Bazel and CMake, but contributions for other build systems are welcome.
 
 Implements ideas from the following papers: