fix(api): venv installation instructions

README.md

@@ -138,7 +138,7 @@ While there are certainly many ways to get started hacking desec-stack, here is
     jq, httpie, libmariadbclient-dev, python3-dev (>= 3.7) and python3-venv (>= 3.7) are useful if you want to follow this guide.
     The webapp requires nodejs. To install everything you need for this guide except docker and docker-compose, use
 
-       sudo apt install certbot curl git httpie jq libmariadbclient-dev nodejs python3.7-dev python3.7-venv
+       sudo apt install certbot curl git httpie jq libmariadbclient-dev nodejs python3.7-dev python3.7-venv libmemcached-dev
 
 1. **Get the code.** Clone this repository to your favorite location.
 

api/Dockerfile

@@ -1,6 +1,7 @@
 FROM python:3.8-buster
 
 RUN apt-get update && apt-get install -y \
+        # updating this list may require updating /README.md
 		gcc \
 		gettext \
 		default-mysql-client default-libmysqlclient-dev \