replace travis config with gh actions

.github/CONTRIBUTING.md

@@ -1,37 +1,44 @@
 ## Contributing
 
-You can run the test suite against a live server by running `script/test`. It
-automatically starts a test server in background. Only tests in
-`test/adapters/*_test.rb` require a server, though.
+In Faraday we always welcome new ideas and features, however we also have to ensure
+that the overall code quality stays on reasonable levels.
+For this reason, before adding any contribution to Faraday, we highly recommend reading this
+quick guide to ensure your PR can be reviewed and approved as quickly as possible.
+
+We are pushing towards a 1.0 release, when we will have to follow [Semantic
+Versioning][semver]. If your patch includes changes to break compatibility,
+note that so we can add it to the [Changelog][].
 
-``` sh
-# setup development dependencies
-$ script/bootstrap
 
-# run the whole suite
-$ script/test
+### Required Checks
 
-# run only specific files
-$ script/test excon patron
+Before pushing your code and opening a PR, we recommend you run the following checks to avoid
+our GitHub Actions Workflow to block your contribution.
 
-# run tests using SSL
-$ SSL=yes script/test
+```bash
+# Run unit tests and check code coverage
+$ bundle exec rspec
+
+# Run Rubocop and check code style
+$ bundle exec rubocop
 ```
 
+
 ### New Features
 
-When adding a feature Faraday:
+When adding a feature in Faraday:
 
 1. also add tests to cover your new feature.
 2. if the feature is for an adapter, the **attempt** must be made to add the same feature to all other adapters as well.
-3. start opening an issue describing how the new feature will work, and only after receiving the green light by the core team start working on the PR.
+3. start opening an issue describing how the new feature will work, and only after receiving
+the green light by the core team start working on the PR.
 
-### New Middlewares
+
+### New Middleware
 
 We will accept middleware that:
 
-1. is useful to a broader audience, but can be implemented relatively
-   simple; and
+1. is useful to a broader audience, but can be implemented relatively simple; and
 2. which isn't already present in [faraday_middleware][] project.
 
 
@@ -43,10 +50,26 @@ We will accept adapters that:
 1. are proven and may have better performance than existing ones; or
 2. if they have features not present in included adapters.
 
-We are pushing towards a 1.0 release, when we will have to follow [Semantic
-Versioning][semver].  If your patch includes changes to break compatibility,
-note that so we can add it to the [Changelog][].
 
-[semver]:    http://semver.org/
-[changelog]: https://github.com/lostisland/faraday/releases
-[faraday_middleware]: https://github.com/lostisland/faraday_middleware/wiki
+### Changes to Faraday Website
+
+The [Faraday Website][website] is included in the Faraday repository, under the `/docs` folder.
+If you want to apply changes to it, please test it locally using `Jekyll`.
+
+```bash
+# Navigate into the /docs folder
+$ cd docs
+
+# Install Jekyll dependencies, this bundle is different from Faraday's one.
+$ bundle install
+
+# Run the Jekyll server with the Faraday website
+$ bundle exec jekyll serve
+
+# The site will now be reachable at http://127.0.0.1:4000/faraday/
+```
+
+[semver]:               http://semver.org/
+[changelog]:            https://github.com/lostisland/faraday/releases
+[faraday_middleware]:   https://github.com/lostisland/faraday_middleware
+[website]:              https://lostisland.github.io/faraday

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  pull_request:
+
+  push:
+    branches: [master, 0.1x]
+
+env:
+  GIT_COMMIT_SHA: ${{ github.sha }}
+  GIT_BRANCH: ${{ github.ref }}
+  CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby: [2.3.x, 2.4.x, 2.5.x, 2.6.x]
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get install libcurl4-openssl-dev
+
+    - name: Set up Ruby
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+
+    - name: Build
+      run: |
+        gem install bundler
+        bundle install --jobs 4 --retry 3
+
+    - name: Test
+      run: bundle exec rake

.github/workflows/publish.yml

@@ -0,0 +1,29 @@
+name: Publish
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Publish to Rubygems
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Set up Ruby 2.6
+        uses: actions/setup-ruby@v1
+        with:
+          version: 2.6.x
+
+      - name: Publish to RubyGems
+        run: |
+          mkdir -p $HOME/.gem
+          touch $HOME/.gem/credentials
+          chmod 0600 $HOME/.gem/credentials
+          printf -- "---\n:rubygems_api_key: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
+          gem build faraday.gemspec
+          gem push faraday-*.gem
+        env:
+          GEM_HOST_API_KEY: ${{ secrets.RUBYGEMS_AUTH_TOKEN }}