README: Fix code blocks

README.md

@@ -30,28 +30,28 @@ The instructions below were tested on Ubuntu Linux 20.04 LTS.
 
 1. Install `python3` and `pip`:
 
-  apt install python3
+    apt install python3
 
 2. Install package dependencies:
 
-  pip install docopt
+    pip install docopt
 
 3. Clone the repository somewhere:
 
-  cd /opt
-  git clone https://github.com/iSoron/hetzner-ddns.git
+    cd /opt
+    git clone https://github.com/iSoron/hetzner-ddns.git
 
 4. Install the script system-wide:
 
-  cd hetzner-ddns
-  sudo make install
+    cd hetzner-ddns
+    sudo make install
 
 5. Create a configuration file in `/etc/hetzner-ddns.conf` with you API token. See `/etc/hetzner-ddns.conf.example` for an example.
 
 6. Run script and enable it during boot:
 
-  systemctl start hetzner-ddns
-  systemctl enable hetzner-ddns
+    sudo systemctl start hetzner-ddns
+    sudo systemctl enable hetzner-ddns
 
 ## License