Replace GitHub Actions workflow with Travis CI (#4)

Replace GitHub Actions workflow with Travis CI

.travis.yml

@@ -0,0 +1,36 @@
+notifications:
+  email: false
+
+branches:
+  only:
+    - master
+    - develop
+    - /^v\d+\.\d+\.\d+/
+
+language: node_js
+cache:
+  yarn: true
+node_js:
+  - '10'
+
+matrix:
+  fast_finish: true
+
+install:
+  - yarn install --frozen-lockfile --non-interactive
+
+jobs:
+  include:
+    - stage: Build
+      script:
+        - yarn run build
+
+    - stage: Lint and Check
+      script:
+        - yarn run check
+        - yarn run lint
+
+    - stage: Test
+      script:
+        - yarn run coverage
+        - yarn run codecov

README.md

@@ -6,8 +6,8 @@
 <a href="https://npmjs.com/package/@urql/exchange-suspense">
   <img alt="NPM Version" src="https://img.shields.io/npm/v/@urql/exchange-suspense.svg" />
 </a>
-<a href="https://github.com/FormidableLabs/urql-exchange-suspense/actions">
-  <img alt="Test Status" src="https://github.com/FormidableLabs/urql-exchange-suspense/workflows/CI/badge.svg" />
+<a href="https://travis-ci.org/FormidableLabs/urql-exchange-suspense">
+  <img alt="Test Status" src="https://api.travis-ci.org/FormidableLabs/urql-exchange-suspense.svg?branch=master" />
 </a>
 <a href="https://codecov.io/gh/FormidableLabs/urql-exchange-suspense">
   <img alt="Test Coverage" src="https://codecov.io/gh/FormidableLabs/urql-exchange-suspense/branch/master/graph/badge.svg" />