Upgrade ohmyzsh and edit musicsync

exact_dot_oh-my-zsh/exact_plugins/exact_pod/README.md

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+# pod
+
+This plugin adds completion for [`CocoaPods`](https://cocoapods.org/).
+CocoaPods is a dependency manager for Swift and Objective-C Cocoa projects.
+
+To use it, add `pod` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... pod)
+```