执行composer遇到bower-asset错误解决方案

执行composer遇到问题如下：
Your requirements could not be resolved to an installable set of packages.


  Problem 1
    - yiisoft/yii2-bootstrap 2.0.8 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.7 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.6 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.5 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.4 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.3 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.2 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.1 requires bower-asset/bootstrap 3.3.* | 3.2.* | 3.1.* -> no matching package found.
    - yiisoft/yii2-bootstrap 2.0.0 requires bower-asset/bootstrap 3.2.* | 3.1.* -> no matching package found.
    - Installation request for yiisoft/yii2-bootstrap * -> satisfiable by yiisoft/yii2-bootstrap[2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8].


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 for more details.
 - It's a private package and you forgot to add a custom repository to find it




解决：composer global require "fxp/composer-asset-plugin:~1.1"