Added class and os alternates

.oh-my-zsh/plugins/tig/README.md

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+# `tig` plugin
+
+This plugin adds some aliases for people who work with `tig` in
+a regular basis. To use it, add `tig` to your plugins array:
+
+```zsh
+plugins=(... tig)
+```
+
+## Features
+
+| Alias | Command        | Description                                     |
+|-------|----------------|-------------------------------------------------|
+| `tis` | `tig status`   | Show git status                                 |
+| `til` | `tig log`      | Show git log                                    |
+| `tib` | `tig blame -C` | `git-blame` a file detecting copies and renames |

.oh-my-zsh/plugins/tig/tig.plugin.zsh

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+alias tis='tig status'
+alias til='tig log'
+alias tib='tig blame -C'