Add println and printf to LogTracer

Author: 64json

package.json

@@ -1,7 +1,13 @@
 {
   "name": "algorithm-visualizer",
-  "version": "2.1.6",
+  "version": "2.2.0",
   "description": "Visualization Library for JavaScript",
+  "keywords": [
+    "algorithm",
+    "data-structure",
+    "visualization",
+    "animation"
+  ],
   "main": "dist/tracers.js",
   "scripts": {
     "build": "node ./node_modules/webpack/bin/webpack --bail --progress --config webpack.config.js",

src/LogTracer.js

@@ -4,8 +4,8 @@ class LogTracer extends Tracer {
   constructor(title) {
     super(title);
 
-    this.register('LogTracer', 'set', 'reset', 'delay', 'print');
+    this.register('LogTracer', 'set', 'reset', 'delay', 'print', 'println', 'printf');
   }
 }
 
-export default LogTracer;
+export default LogTracer;