Fixed coverage reporting (#164)

* Fixed coverage reporting
* Added ubuntu 22.04 to GH build

.github/workflows/tests.yaml

@@ -18,7 +18,7 @@ jobs:
       strategy:
         matrix:
           python-version: [ '3.8', '3.12' ]
-          os: [ "ubuntu-24.04" ]
+          os: [ "ubuntu-22.04", "ubuntu-24.04" ]
         fail-fast: false
 
       runs-on: "${{ matrix.os }}"
@@ -34,7 +34,7 @@ jobs:
 
         - name: "Install test dependencies"
           run: |
-            pip install -r dev-requirements.txt
+            pip install -r dev-requirements.txt coveralls
 
         - name: "Check style"
           run: |
@@ -47,3 +47,4 @@ jobs:
         - name: "Run tests"
           run: |
             make cover
+            coveralls

README.md

@@ -1,5 +1,5 @@
 <a href="https://pypi.python.org/pypi/pyswip"><img src="https://img.shields.io/pypi/v/pyswip.svg?maxAge=2592&updated=2"></a>
-<a href="https://travis-ci.org/yuce/pyswip"><img src="https://api.travis-ci.org/yuce/pyswip.svg?branch=master"></a>
+<img src="https://img.shields.io/github/actions/workflow/status/yuce/pyswip/tests.yaml">
 <a href="https://coveralls.io/github/yuce/pyswip"><img src="https://coveralls.io/repos/github/yuce/pyswip/badge.svg?branch=master"></a>
 
 # PySwip