Unable to install via Composer

[kenjis]

$ composer require deployer/deployer:~3.0
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - deployer/deployer v3.0.4 requires phpseclib/phpseclib dev-master#2c96af214bf1b5e29b707249108504b4e0041a21 -> no matching package found.
    - deployer/deployer v3.0.3 requires phpseclib/phpseclib dev-master#2c96af214bf1b5e29b707249108504b4e0041a21 -> no matching package found.
    - deployer/deployer v3.0.2 requires phpseclib/phpseclib dev-master#2c96af214bf1b5e29b707249108504b4e0041a21 -> no matching package found.
    - deployer/deployer v3.0.1 requires phpseclib/phpseclib dev-master#2c96af214bf1b5e29b707249108504b4e0041a21 -> no matching package found.
    - deployer/deployer v3.0.0 requires phpseclib/phpseclib dev-master#2c96af214bf1b5e29b707249108504b4e0041a21 -> no matching package found.
    - Installation request for deployer/deployer ~3.0 -> satisfiable by deployer/deployer[v3.0.0, v3.0.1, v3.0.2, v3.0.3, v3.0.4].

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.

Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

Installation failed, deleting ./composer.json.

[Lynnworld]

please refer #259

[kenjis]

Oh I'm sorry. I overlooked it.