Remove Travis-CI configuration

.gitattributes

@@ -1,3 +1,3 @@
 .gitattributes export-ignore  
 .gitignore export-ignore
-.travis.yml export-ignore
+.github export-ignore

.travis.yml

@@ -1,23 +0,0 @@
-os: linux
-language: python
-jobs:
-  include:
-    - python: "3.6"
-    - python: "3.7"
-    - python: "3.8"
-    - python: "3.9"
-cache: pip
-git:
-  depth: false
-dist: xenial
-# command to install dependencies
-install:
-  - pip install -U tox-travis setuptools
-# command to run tests
-script: tox
-notifications:
-  irc:
-    channels:
-      - "chat.freenode.net#dosage"
-    use_notice: true
-    skip_join: true

README.md

@@ -1,6 +1,6 @@
 # Dosage
 
-[![Build Status](https://travis-ci.com/webcomics/dosage.svg?branch=master)](https://travis-ci.com/webcomics/dosage)
+[![Tests](https://github.com/webcomics/dosage/actions/workflows/test.yml/badge.svg)](https://github.com/webcomics/dosage/actions/workflows/test.yml)
 [![Code Climate](https://codeclimate.com/github/webcomics/dosage/badges/gpa.svg)](https://codeclimate.com/github/webcomics/dosage)
 [![codecov](https://codecov.io/gh/webcomics/dosage/branch/master/graph/badge.svg)](https://codecov.io/gh/webcomics/dosage)
 ![Maintenance](https://img.shields.io/maintenance/yes/2021.svg)
@@ -128,6 +128,6 @@ existing module classes for examples.
 
 ### Test suite status
 
-Dosage has extensive unit tests to ensure the code quality.
-[Travis-CI](https://travis-ci.org/) is used for continuous build and test
-integration. See the badges at the top of this page for the current status.
+Dosage has unit tests to ensure code quality. GitHub Actions are used for
+continuous build and test integration. See the badges at the top of this page
+for the current status.

tox.ini

@@ -22,10 +22,6 @@ commands =
         --cov-report=html:{toxworkdir}/reports/{envname}/htmlcov \
         {posargs}
 
-
-passenv = CI TRAVIS TRAVIS_*
-deps =
-    pytest-travis-fold
 # Also install extra dependencies for tests.
 extras =
     css