fix(challenge): syntax error in sample code snippet

.gitignore

@@ -1,8 +1,67 @@
-node_modules
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
 
-dist
-unpacked/
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
 
-*.log
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
 *.tgz
-*.patch
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next
+
+# IDE
+.idea
+*.iml
+.DS_Store
+Thumbs.db

challenges/02-javascript-algorithms-and-data-structures/es6.json

@@ -258,7 +258,7 @@
       "description": [
         "As seen in the previous challenge, <code>const</code> declaration alone doesn't really protect your data from mutation. To ensure your data doesn't change, JavaScript provides a function <code>Object.freeze</code> to prevent data mutation.",
         "Once the object is frozen, you can no longer add, update, or delete properties from it. Any attempt at changing the object will be rejected without an error.",
-        "<blockquote>let obj = {<br>&nbsp;&nbsp;name:\"FreeCodeCamp\"<br>&nbsp;&nbsp;review:\"Awesome\"<br>};<br>Object.freeze(obj);<br>obj.review = \"bad\"; //will be ignored. Mutation not allowed<br>obj.newProp = \"Test\"; // will be ignored. Mutation not allowed<br>console.log(obj); <br>// { name: \"FreeCodeCamp\", review:\"Awesome\"}</blockquote>",
+        "<blockquote>let obj = {<br>&nbsp;&nbsp;name:\"FreeCodeCamp\",<br>&nbsp;&nbsp;review:\"Awesome\"<br>};<br>Object.freeze(obj);<br>obj.review = \"bad\"; //will be ignored. Mutation not allowed<br>obj.newProp = \"Test\"; // will be ignored. Mutation not allowed<br>console.log(obj); <br>// { name: \"FreeCodeCamp\", review:\"Awesome\"}</blockquote>",
         "<hr>",
         "In this challenge you are going to use <code>Object.freeze</code> to prevent mathematical constants from changing. You need to freeze the <code>MATH_CONSTANTS</code> object so that no one is able alter the value of <code>PI</code>, add, or delete properties ."
       ],