🚧 Replace Travis with CircleCI

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2.1
+
+jobs:
+  test:
+    docker:
+      - image: circleci/python:<< parameters.python-version >>
+    steps:
+      - run: locale-gen "en_US.UTF-8"; update-locale LC_ALL="en_US.UTF-8"
+      - checkout
+      - run: pip3 install --upgrade pip
+      - run: pip3 install -r requirements.txt
+      - run: pytest
+
+workflows:
+  all-tests:
+    jobs:
+      - test:
+          matrix:
+            parameters:
+              python-version: ["3.5", "3.6", "3.7", "3.8", "3.9"]

.travis.yml

@@ -1,16 +0,0 @@
-dist: xenial  # required for Python >= 3.7
-language: python
-cache: pip
-python:
-  - "3.5"
-  - "3.6"
-  - "3.7"
-  - "3.8"
-  - "3.9"
-
-
-install:
-  - pip install -r requirements.txt
-
-script:
-  - pytest