Update doc

package.json

@@ -1,7 +1,7 @@
 {
   "devDependencies": {
     "cucumber": "^6.0.5",
-    "nightwatch": "^1.4.1",
+    "nightwatch": "^1.4.3",
     "nightwatch-api": "^3.0.1"
   },
   "scripts": {

test/acceptance/README.md

@@ -37,6 +37,15 @@ Now we can run selenium by two ways:
    apt install yarnpkg
    ```
 
+* Install *nodejs* libraries. For example on Ubuntu:
+
+   ```
+   apt install npm
+   npm install cucumber
+   npm install nightwatch-api
+   npm install nightwatch
+   npm update
+   ```
 
 * In *nightwatch.conf.js* file inside the root directory of the project and inside the configuration file following environment variable has been specified. We can change the default values according to our local configuration.