Merge pull request #1391 from Perflyst/update-requirements

Add zlib1g-dev as requirement

README.md

@@ -92,7 +92,7 @@ $ curl -sSL https://dist.crystal-lang.org/apt/setup.sh | sudo bash
 $ curl -sL "https://keybase.io/crystal/pgp_keys.asc" | sudo apt-key add -
 $ echo "deb https://dist.crystal-lang.org/apt crystal main" | sudo tee /etc/apt/sources.list.d/crystal.list
 $ sudo apt-get update
-$ sudo apt install crystal libssl-dev libxml2-dev libyaml-dev libgmp-dev libreadline-dev postgresql librsvg2-bin libsqlite3-dev
+$ sudo apt install crystal libssl-dev libxml2-dev libyaml-dev libgmp-dev libreadline-dev postgresql librsvg2-bin libsqlite3-dev zlib1g-dev
 ```
 
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