composer [ReflectionException] Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist

在执行composer update时报错

[ReflectionException]
Class Fxp\Composer\AssetPlugin\Repository\NpmRepository does not exist

是因为 fxp/composer-asset-plugin 升级导致的，所以只要升级 fxp/composer-asset-plugin 就可以解决

composer global update fxp/composer-asset-plugin --no-plugins

FROM：
http://*.com/questions/36437837/composer-throw-reflectionexception-class-fxp-composer-assetplugin-repository-n