migrate md5 to bcrypt

LoginController.php

protected function attemptLogin(Request $request)
{
    $check = $this->guard()->attempt(
        $this->credentials($request), $request->has('remember')
    );
    if ($check === false)
    {
        $user = User::where('username','=',$request->input('username'))->first();

        if(isset($user)) {
            // If their password is still MD5
            if($user->password == md5($request->input('password'))) {
                // Convert to new format
                $hashed_password = Hash::make($request['password']);
                $user->password = $hashed_password;
                $user->save();

                $request->session()->regenerate();
                $this->clearLoginAttempts($request);
                Auth::login($user, true);
                return true;
            } else {
                // Redirect to the login page.
                return false;
            }
        }
    }
    return $check;
}