remove .travis.yml (#26)

* remove .travis.yml

* update pythons versions for tests

---------

Co-authored-by: Javier Cordero <github@j2i.me>

.github/workflows/ci.yml

@@ -16,17 +16,14 @@ jobs:
       matrix:
         include:
           - os: ubuntu-latest
-            python-version: '2.7'
-            django-version: '1.11.29'
-          - os: ubuntu-latest
-            python-version: '3.5'
+            python-version: '3.7'
             django-version: '1.11.29'
           - os: ubuntu-latest
             python-version: '3.9'
             django-version: '2.2.28'
           - os: ubuntu-latest
-            python-version: '3.9'
-            django-version: '3.2.13'
+            python-version: '3.10'
+            django-version: '3.2.23'
     services:
       postgres:
         image: postgres
@@ -46,6 +43,7 @@ jobs:
         with:
           python-version: '${{ matrix.python-version }}'
       - uses: actions/checkout@v2
+      - run: pip install --upgrade pip
       - run: pip install django==${{ matrix.django-version}}
       - run: pip install psycopg2
       - run: psql -d template1 -c 'create extension cube;' -U $POSTGRES_USER -h localhost