Modernize the meta files of the project

INSTALL.rst

@@ -1,12 +1,11 @@
 REQUIREMENTS
 ============
-- Python 3
-- Python package virtualenv (in most cases this is distributed or installed together with python)
-- Django (will be installed automatically)
-- Several additional django related python packages (will be installed automatically)
+- Python >= 3
+- Django and some other python packages, that will be installed throughout
+  the installation process
 
 For production use you surly want a real web server that supports WSGI
-(e.g. Apache httpd with mod_wsgi) and a real Database like PostgreSQL.
+(e.g. Apache httpd with mod_wsgi) and a real Database like PostgreSQL (psycopg2).
 
 
 QUICK INSTALLATION FOR THE IMPATIENT
@@ -24,14 +23,11 @@ INSTALLATION
 It is strongly recommended to create a separated python environment
 for this django project. But it is not exactly necessary.
 
-The creation of a separated python environment is very easy with the
-virtualenv tool (a python package).
-
 If you decide to not use virtualenv, proceed with step 2.
 
 - Create the python environment in a directory called ./env/python:
 
-  ``virtualenv --prompt="(dav)" ./env/python``
+  ``python -m venv --prompt="(dav)" ./env/python``
 
 - If you use a posix compatible shell (like bash, the linux default shell),
   you have to activate the environment for the current shell session
@@ -50,16 +46,25 @@ If you have left the session or deactivated the environment and want to
 reactivate the environment (e.g. to execute a python command) use the
 previous ``source ...`` command.
 
-2. Install files
-----------------
+2. Install requirements
+-----------------------
+
+- ``python -m pip install -r requirements.txt``
+
+3. Install project code in development mode
+-------------------------------------------
+
+- ``python -m pip install -e .``
+
+4. Setup django project directory
+---------------------------------
 
-- ``python setup.py develop``
 - ``django-dav-events-admin setup ./env/django``
 
 The django project directory ('./env/django' within the previous example)
 will be called *project root* for now on.
 
-3. Enable modules
+5. Enable modules
 -----------------
 Our web application consist of several modules, that care about single
 aspects of the whole picture.