Add missing library on install

For people who have not every required packages, or working like me from a fresh docker container.
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Romain Weeger 2019-02-18 15:56:19 +01:00 committed by GitHub
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@ -25,7 +25,7 @@ It browses the repository and outputs html page with statistics.
### Ubuntu
$ sudo apt-get install ruby ruby-dev
$ sudo apt-get install ruby ruby-dev gcc zlib1g-dev make
$ sudo gem install git_stats
## Usage