Commits on Mar 18, 2020

1. Add Rugged::Config#add …

   This method allows you to set multiple values for the same key in a
   particular config, similar to `git config --add "include.path" some/path`.
   
   For example, I have a git config with an existing `include.path` value:
   
   ```
   $ cat ~/src/opensource/rugged/.git/config
   [core]
           repositoryformatversion = 0
           filemode = true
           bare = false
           logallrefupdates = true
           ignorecase = true
           precomposeunicode = true
   [remote "origin"]
           url = [email protected]:codenamev/rugged.git
           fetch = +refs/heads/*:refs/remotes/origin/*
   [branch "master"]
           remote = origin
           merge = refs/heads/master
   [submodule "vendor/libgit2"]
           active = true
           url = https://github.com/libgit2/libgit2.git
   [include]
           path = /Users/codenamev/.gitconfig.reflow
   ```
   
   With `Rugged::Config#add` I can set another value for `include.path`
   without overwriting the existing value:
   
   ```
   ruby -I lib -rrugged -e'\
   config = Rugged::Repository.new("/Users/codenamev/src/opensource/rugged").config;
   config.add("include.path", "/Users/codenamev/.gitconfig.extras");
   p config.get_all("include.path")'
   ["/Users/codenamev/.gitconfig.reflow", "/Users/codenamev/.gitconfig.extras"]
   ```
   
   References libgit2#725

   

   codenamev committed Mar 18, 2020
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