Add upstream oh_my_zsh repo

zsh/plugins/powify/README.md

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+# powify plugin
+
+This plugin adds autocompletion for [powify](https://github.com/sethvargo/powify),
+an easy-to-use wrapper for Basecamp's [pow](https://github.com/basecamp/pow).
+
+To use it, add powify to the plugins array of your zshrc file:
+
+```sh
+plugins=(... powify)
+```