Add misMatchThreshold example to README

README.md

@@ -141,7 +141,13 @@ The resemble.compare API provides a convenience function that is used as follows
 const compare = require("resemblejs").compare;
 
 function getDiff() {
-    const options = {};
+    const options = {
+      // stop comparing once determined to be > 5% non-matching; this will
+      // also enable compare-only mode and no output image will be rendered;
+      // the combination of these results in a significant speed-up in batch processing
+      misMatchThreshold: 5
+    };
+
     // The parameters can be Node Buffers
     // data is the same as usual with an additional getBuffer() function
     compare(image1, image2, options, function(err, data) {