Fixed typo in 9.4

Line read `contructor(options = {}) {` Edited to `constructor(options = {}) {` No other lines were edited or changed.

Author: Ryan-McBride

README.md

@@ -704,7 +704,7 @@
 
  ```javascript
  class Jedi {
- contructor(options = {}) {
+ constructor(options = {}) {
  this.name = options.name || 'no name';
  }