Add automated install-update steps for Linux

README.md

@@ -38,7 +38,19 @@ brew install lazydocker
 
 ### Binary Release (Linux/OSX)
 
-You can download a binary release [here](https://github.com/jesseduffield/lazydocker/releases).
+You can manually download a binary release from [the release page](https://github.com/jesseduffield/lazydocker/releases).
+
+Automated install/update:
+
+```sh
+GITHUB_LATEST_VERSION=$(curl -L -s -H 'Accept: application/json' https://github.com/jesseduffield/lazydocker/releases/latest | sed -e 's/.*"tag_name":"\([^"]*\)".*/\1/')
+GITHUB_FILE="lazydocker_${GITHUB_LATEST_VERSION//v/}_$(uname -s)_$(uname -m).tar.gz"
+GITHUB_URL="https://github.com/jesseduffield/lazydocker/releases/download/${GITHUB_LATEST_VERSION}/${GITHUB_FILE}"
+wget -O lazydocker.tar.gz $GITHUB_URL
+tar xzvf lazydocker.tar.gz lazydocker
+sudo mv -f lazydocker /usr/local/bin/
+rm lazydocker.tar.gz
+```
 
 ### Go