added latest node.js release and fixed node.js url

Author: Denis Karlyuk

.travis.yml

@@ -1,3 +1,3 @@
 language: node_js
 node_js:
-  - "5.10.0"
+  - "lts/*"

README.md

@@ -33,7 +33,7 @@ To start javascript assignments please follow the next steps:
 
 
 ### How to setup work environment
-* Download and install the latest [Nodejs](https://nodejs.org/en/download/stable/).
+* Download and install the latest [Nodejs](https://nodejs.org/en/download/).
 * Run `npm install` from you repository folder to download the required modules. All dependent modules will be located in the  *node_modules* folder.
 * Open your favorite editor and complete tasks.
 * Open your terminal and use `npm test` command to run all tests. You can run single file by passing it as argument `npm test ./test/01-strings-tests.js`.