Bikeshed/Travis-CI update

.travis.yml

@@ -1,14 +1,16 @@
 sudo: false
 language: python
 python:
-- '3.8'
+  - "3.8"
+
 install:
-- pip install pygments lxml setuptools --upgrade
-- git clone https://github.com/tabatkins/bikeshed.git
-- pip install --editable $PWD/bikeshed
-- bikeshed update
+  # See: https://tabatkins.github.io/bikeshed/#travis-ci
+  - pip3 install bikeshed
+  - bikeshed update
+
 script:
-- bash "./deploy.sh"
+  - bash "./deploy.sh"
+
 env:
   global:
   - ENCRYPTION_LABEL: "b6936e521be2"