adding example for image.resize

Author: Lauren McCarthy

lib/p5.js

@@ -1023,7 +1023,7 @@ var p5Image = function (require, core, filters) {
       var tempCanvas = document.createElement('canvas');
       tempCanvas.width = width;
       tempCanvas.height = height;
-      tempCanvas.getContext('2d').drawImage(this.canvas, 0, 0, this.canvas.width, this.canvas.height, 0, 0, tempCanvas.width, tempCanvas.width);
+      tempCanvas.getContext('2d').drawImage(this.canvas, 0, 0, this.canvas.width, this.canvas.height, 0, 0, tempCanvas.width, tempCanvas.height);
       this.canvas.width = this.width = width;
       this.canvas.height = this.height = height;
       this.drawingContext.drawImage(tempCanvas, 0, 0, width, height, 0, 0, width, height);