ci: migrate from Travis CI to GitHub Actions

Signed-off-by: umarcor <unai.martinezcorral@ehu.eus>

.github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3cc0681..4ce83c5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,3 +13,31 @@
     - uses: actions/checkout@v2
 
     - uses: symbiflow/actions/checks@main
+
+
+  Tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { version: 3.5, ver: 35 }
+          - { version: 3.6, ver: 36 }
+          - { version: 3.7, ver: 37 }
+          - { version: 3.8, ver: 38 }
+          - { version: 3.9, ver: 39 }
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.version}}
+
+    - name: Install dependencies
+      run: |
+        pip install wheel setuptools
+        pip install tox
+
+    - run: python -m tox
+      env:
+        TOXENV: py${{ matrix.ver}}

.travis.yml

diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index d5791ae..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-language: python
-
-matrix:
-  include:
-    - python: 3.5
-      env: TOXENV=py35
-    - python: 3.6
-      env: TOXENV=py36
-    - python: 3.7
-      env: TOXENV=py37
-
-install: pip install tox
-
-script: tox
-
-notifications:
-  email: false