docs: fixing README.md build status image (#151)

Migrate to GitHub Actions. Closes #151.

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        python-version: [2.7, 3.5, 3.6, 3.7, pypy-2.7, pypy-3.7]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install -r requirements.dev.txt
+      - name: Run tests
+        run: |
+          nosetests --with-coverage --cover-package gixy -v
+      - name: Run flake8
+        run: |
+          flake8 --max-line-length=120 setup.py gixy

.travis.yml

@@ -1,18 +0,0 @@
-language: python
-dist: xenial
-sudo: false
-python:
-  - "2.7"
-  - "3.5"
-  - "3.6"
-  - "3.7"
-  - "pypy"
-  - "pypy3"
-
-install:
-  - pip install -r requirements.txt
-  - pip install -r requirements.dev.txt
-
-script:
-  - nosetests --with-coverage --cover-package gixy -v
-  - if [[ $TRAVIS_PYTHON_VERSION != '2.6' ]]; then flake8 --max-line-length=120 setup.py gixy; fi

README.md

@@ -1,7 +1,7 @@
 GIXY
 ====
 [![Mozilla Public License 2.0](https://img.shields.io/github/license/yandex/gixy.svg?style=flat-square)](https://github.com/yandex/gixy/blob/master/LICENSE)
-[![Build Status](https://img.shields.io/travis/yandex/gixy.svg?style=flat-square)](https://travis-ci.org/yandex/gixy)
+[![CI](https://github.com/yandex/gixy/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/yandex/gixy/actions/workflows/ci.yml)
 [![Your feedback is greatly appreciated](https://img.shields.io/maintenance/yes/2019.svg?style=flat-square)](https://github.com/yandex/gixy/issues/new)
 [![GitHub issues](https://img.shields.io/github/issues/yandex/gixy.svg?style=flat-square)](https://github.com/yandex/gixy/issues)
 [![GitHub pull requests](https://img.shields.io/github/issues-pr/yandex/gixy.svg?style=flat-square)](https://github.com/yandex/gixy/pulls)