[doc]Composer is not a package manager.

It is a issue i found when I translate it. > Composer is not a package manager, It's a tool for dependency management. According to their [doc](https://getcomposer.org/doc/00-intro.md) >Composer is a tool for dependency management in PHP. It allows you to declare the dependent libraries your project needs and it will install them in your project for you. and > **Composer is not a package manager.** Yes, it deals with "packages" or libraries, but it manages > them on a per-project basis, installing them in a directory (e.g. vendor) inside your project. By > default it will never install anything globally. Thus, it is a dependency manager. So i think, It will be better, if we remain their offical appellation.

[doc]Composer is not a package manager.
ebb27ef4 · 东方孤思子（Paris·QianSen） · ed5007e4 · ebb27ef4
Commit ebb27ef4 authored Mar 12, 2014 by 东方孤思子（Paris·QianSen）
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 Composer
 ========
-Yii2 uses Composer as its package manager. Composer is a PHP utility that can automatically handle the installation of needed libraries and
+Yii2 uses Composer as its dependency management tool. Composer is a PHP utility that can automatically handle the installation of needed libraries and
 extensions, thereby keeping those third-party resources up to date while absolving you of the need to manually manage the project's dependencies.
 Installing Composer