Improve CI workflow

.travis.yml

 language: python
-python:
-- 3.5
-- 3.8
 sudo: false
 install:
 - pip install -r requirements/travis.txt
-script:
-- make quality
-- make test
 after_success: coveralls
 env:
   global:
@@ -22,3 +16,15 @@ deploy:
     tags: true
   password:
     secure: DKlhHIFctJS9k/1sdlKfL34MwVIHxZn6QwrQ4/jMaiucNARP7MUoTEhd5wEN7wNMyafsYfkY960/dJuqgF6ztZzt7jYX+Nu9o0YEOM742f5hcqQcn/k2GrU2X5+hMgAVUL3YP4JlZwst4pRM1eRlzXgsoxqCET84V2biS1d04ivJgKO5T9NNHTeIQDRDpSpUVuloY1qVMS6IFewLjL6XZuCYtCBXBcBN29EDFvy8v683JAZyz332Xr8R0yF/u09XFKnW+migeiT9gWNafIKXgDAidr0gbkF4r71OdGCUxhCwa+/IHnAYCptajzd4QUd2gj5yOccbVhtUondK3DSA6NaAHdwFjmU7XS5XouDlMS83wyTbqGlEXj9dEuY6lq/UXeUjvfmbqUc1W5qi7eKGxY2qZ1+3HucnCVlPbzgEVMxnPN/YtPe59SSay60gFD7KyZfxxavLsuhSFM4+aZ/hyW9pI1vu+k9UuVVEw9QisUORHHg5YYC75BsVXI5kkhXAF7F880cFlV+DPEt7mwM0xsAPcbyStmmJ+7sXkoI6bWF+QsveqgY4SPYD14bZ8v3PK4b5UzrQOHSEpa1NNrm7942lnkySoC5Rm6YIShnLdJ+Gdf8wb4RezqnhmZcKVc/9QXQcUga+nj5CRUb9wFVncmak2tf8aAvfqeML8pHzkrs=
+
+jobs:
+  include:
+  - name: Python 3.5 - Tests
+    script: make test
+    python: "3.5"
+  - name: Python 3.8 - Tests
+    script: make test
+    python: "3.8"
+  - name: Code Quality
+    script: make quality
+    python: "3.5"
\ No newline at end of file

Makefile

@@ -15,8 +15,8 @@ compile-sass:  ## Compile the Sass assets
 	sass --no-cache --style compressed ./lti_consumer/static/sass/student.scss ./lti_consumer/static/css/student.css
 
 quality:  ## Run the quality checks
-	-pycodestyle --config=.pep8 lti_consumer
-	-pylint --rcfile=pylintrc lti_consumer
+	pycodestyle --config=.pep8 lti_consumer
+	pylint --rcfile=pylintrc lti_consumer
 
 test:  ## Run the tests
 	mkdir -p var