replace virtualenv with venv

debian-template/postinst

@@ -12,7 +12,7 @@ if [ "$1" = "configure" ] && [ -z "$2" ]; then
 
     ln -sf /etc/smasch/smasch.py /usr/lib/smasch/smash/local_settings.py
 
-    virtualenv --python=python3 /usr/lib/smasch/env
+    python3 -m venv /usr/lib/smasch/env
 
     chown smasch:smasch /etc/smasch/smasch.py
     chmod 0600 /etc/smasch/smasch.py

readme.md

@@ -17,7 +17,7 @@ python manage.py superworker
 ## Required software (on ubuntu's OS family):
   - install required dependencies on ubuntu
 ```bash
-sudo apt-get install python3, virtualenv, libcurl4-gnutls-dev, libpng-dev, libfreetype6-dev, libpq-dev, gcc, g++, python3-dev, libgnutls28-dev, libjpeg-dev, libfreetype6-dev, git
+sudo apt-get install python3, libcurl4-gnutls-dev, libpng-dev, libfreetype6-dev, libpq-dev, gcc, g++, python3-dev, libgnutls28-dev, libjpeg-dev, libfreetype6-dev, git
 ```
   - install nodejs
 ```bash
@@ -33,11 +33,11 @@ apt-get install nodejs
 git clone ssh://git@git-r3lab-server.uni.lu:8022/NCER-PD/scheduling-system.git
 ```
 
-  - setup virtualenv with clean python3 working environment and start using it. Important, currently only python3.6-3.8 are supported
+  - setup a venv with clean python3 working environment and start using it. Important, currently only python3.6-3.8 are supported
 
 ```bash
 cd scheduling-system
-virtualenv env -p python3
+python3 -m venv env
 . env/bin/activate
 ```
 
@@ -93,7 +93,7 @@ After database connection is configured setup a database by applying migration s
 
 
 ## Development
-Remember, that before working you have to activate _virtualenv_ (in project directory), by:
+Remember, that before working you have to activate _venv_ (in project directory), by:
 
 ```bash
 . env/bin/activate