Updated the README.md with the options

Author: Tom Maton

README.md

@@ -37,16 +37,10 @@ gulp.task("polymerize", () => {
 
 ```js
 {
-    // string / function to be used for file names. Can be either a fixed string or a function
-    // that takes a [vinyl](https://github.com/gulpjs/vinyl) file object and returns a string
-    filename: function(file) {
-        return path.basename(file.path, path.extname(file.path)) + "-styles";
-    },
-    // string / function to be used for module ids. Can be either a fixed string or a function
-    // that takes a [vinyl](https://github.com/gulpjs/vinyl) file object and returns a string
-    moduleId: function(file) {
-        return path.basename(file.path, path.extname(file.path)) + "-styles";
-    }
+    // string to be used for the beginning of the file name & module ids.
+    prefix: 'tg-',
+    // string to be used for the end of the file name & module ids.
+    suffix: '-styles'
 }
 ```