Update readme for Python 3.7 installation.

README.md

@@ -61,7 +61,7 @@ git clone https://gitlab.servus.at/autoradio/engine
 ```bash
 sudo apt install \
     git \
-    python3 python3-pip \
+    python3.7 python3.7-pip python3.7-dev \
     redis-server \
     liquidsoap liquidsoap-plugin-icecast \
     mariadb-server libmariadbclient-dev \
@@ -73,7 +73,7 @@ sudo apt install \
 **Install Python Packages:**
 
 ```bash
-sudo pip3 install -r requirements.txt
+./install.sh
 ```
 
 **Setup Database:**
@@ -102,7 +102,6 @@ your time to carefully review those settings!
 
 Read more about detailed settings in the [Configuration Guide](docs/configuration-guide.md).
 
-
 ## Start the Engine
 
 To start the AuRa Engine execute: