Changes runner version to ubuntu 20.04

so tests can be run on 3.6
Replaces pycrypto with pycryptodome, should have the same api
and has wheels for recent python versions

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
 
   js-unit-tests:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04 #Allows to run 3.6 tests (https://github.com/actions/setup-python/issues/544)
 
     steps:
       - uses: actions/checkout@v2
@@ -38,7 +38,7 @@ jobs:
 
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04 #Allows to run 3.6 tests (https://github.com/actions/setup-python/issues/544)
 
     steps:
       - uses: actions/checkout@v2
@@ -56,7 +56,7 @@ jobs:
 
   django-unit-tests:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04 #Allows to run 3.6 tests (https://github.com/actions/setup-python/issues/544)
 
     strategy:
       matrix:
@@ -102,7 +102,7 @@ jobs:
 
   django-search-indexes-tests:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04 #Allows to run 3.6 tests (https://github.com/actions/setup-python/issues/544)
 
     strategy:
       matrix:
@@ -164,8 +164,8 @@ jobs:
 
   django-selenium-tests:
 
-    runs-on: ubuntu-latest
-    
+    runs-on: ubuntu-20.04 #Allows to run 3.6 tests (https://github.com/actions/setup-python/issues/544)
+
     steps:
       - name: Setup PostgreSQL
         run: |
@@ -209,9 +209,9 @@ jobs:
       - django-search-indexes-tests
       - django-selenium-tests
       - js-unit-tests
-    
+
     runs-on: ubuntu-latest
-    
+
     steps:
       - name: Coveralls Finished
         uses: coverallsapp/github-action@master

src/requirements.txt

@@ -12,7 +12,7 @@ regex
 markdown
 django-haystack>=2.8.0,<2.9.0
 whoosh>=2.7.2
-pycrypto
+pycryptodome
 pyScss>=1.3.4,<2.0
 Pygments
 pillow