code: public function set($key, $value, $fromFile = false)
      {
          $keys = array_filter(explode('.', $key));
  
          $value = ($fromFile) ? require $value : $value;
  
          $this->save($keys, $this->data, $value);
  
          return $this;
      }
docs: Sets the value to the specified key.
  
  @param  string  $key
  @param  mixed   $value
  @param  boolean $fromFile
  @param  mixed
  @return self