Fixed issue to properly create the config file

When we require

"bllim/datatables": "*"

from composer, it grabs the latest 1.3.3 tag version, but this tag is missing "/src/config/datatables.php" which is needed when we run the artisan command.

There are two ways to fix this:
1.Require the master branch in composer which does contain the file, 
2. Make a new tag with the latest files from master and confirming that it contains the /config file.

Whichever option you chose, the artisan command in the instructions needs to be updated, the current one listed is not the correct one.