one empty line

Dockerfile

@@ -13,11 +13,9 @@ ENV USER arduino
 
 RUN \
   apt update && \
-  apt install -y vim-tiny && \
+  apt upgrade -y && \
-  apt install -y python-cheetah && \
+  apt install -y python3-cheetah && \
-  apt install -y python3 && \
   pip install pyserial && \
-  rm -rf /var/lib/apt/lists/* && \
   cd /tmp && \
   wget ${ArduinoDownloadUrl}/${ArduinoPackage} && \
   tar -xzf ${ArduinoPackage} && \
@@ -44,7 +42,3 @@ RUN \
 
 CMD ["/bin/bash"]
 
-
-  
-  
-