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brewでインストールしたパッケージをアップデートする方法

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背景

vimとneovimに脆弱性があるとのこと↓
https://github.com/numirias/security/blob/master/doc/2019-06-04_ace-vim-neovim.md

対象は Vim < 8.1.1365, Neovim < 0.3.6とのこと

おもむろにターミナルを確認

$ nvim -v
NVIM v0.3.4

アップグレードは以下のようにします。

### まずはbrewをアップデート。これをしないと最新のパッケージのバージョンを取得できない
$ brew update

### アップグレード対象のパッケージを指定
$ brew upgrade neovim

### 実行後確認
$ nvim -v
NVIM v0.3.7
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