generate(kind, args=[]){
    const c = this.chalk;

    const kinds = {
      'config-fail':`${c.red('A config option (.solcover.js) is incorrectly formatted: ')}` +
                    `${c.red(args[0])}.`,

      'instr-fail': `${c.red('Could not instrument:')} ${args[0]}. ` +
                    `${c.red('(Please verify solc can compile this file without errors.) ')}`,

      'istanbul-fail': `${c.red('Istanbul coverage reports could not be generated. ')}`,

      'sources-fail': `${c.red('Cannot locate expected contract sources folder: ')} ${args[0]}`,
    }

    return this._format(kinds[kind])
  }
Returns a formatted message. Useful for error message.
@param  {String}   kind  message selector
@param  {String[]} args  info to inject into template
@return {String}         message