[deps] Fixed failing local tests because of incompatible django version

Pin django to 3.1.0

Author: atb00ker

.github/workflows/ci.yml

@@ -44,14 +44,16 @@ jobs:
       - name: Install python dependencies
         run: |
           pip install -U pip wheel
-          pip install ${{ matrix.django-version }}
           pip install -U -r requirements-test.txt
       - name: Install npm dependencies
         run: sudo npm install -g jshint
 
       - name: Install openwisp-users
         run: pip install -e .[rest]
 
+      - name: Change Django Version for test
+        run: pip install -U ${{ matrix.django-version }}
+
       - name: QA checks
         run: |
           ./run-qa-checks

README.rst

@@ -144,7 +144,7 @@ Install your forked repo:
 
     git clone git://github.com/<your_fork>/openwisp-users
     cd openwisp-users/
-    pip install -e .
+    pip install -e .[rest]
 
 Install test requirements:
 

requirements.txt

@@ -7,3 +7,4 @@ phonenumbers>=8.11.0,<8.13.0
 openwisp-utils[rest] @ https://github.com/openwisp/openwisp-utils/tarball/master
 packaging
 swapper~=1.1.0
+django~=3.1.0