ci: migrate to GitHub Actions

Due to the recent changes to the Travis CI platform (see [1]), we will
now use GitHub Actions to run the tests.

Note: the certificate was updated because it failed with newer Node.js versions

```
_tls_common.js:129
      c.context.setCert(cert);
                ^

Error: error:140AB18F:SSL routines:SSL_CTX_use_certificate:ee key too small
    at Object.createSecureContext (_tls_common.js:129:17)
    at Server.setSecureContext (_tls_wrap.js:1328:27)
```

Reference: https://docs.github.com/en/free-pro-team@latest/actions/guides/building-and-testing-java-with-maven

[1]: https://blog.travis-ci.com/2020-11-02-travis-ci-new-billing

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '0 0 * * 0'
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        java: [7, 8, 11]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup java
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Cache Maven packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
+      - name: Run the Maven verify phase
+        run: mvn verify -Dgpg.skip=true

.travis.yml

@@ -1,7 +0,0 @@
-language: java
-dist: trusty
-sudo: false
-install: mvn install -DskipTests=true -Dgpg.skip=true
-jdk:
-  - openjdk7
-  - oraclejdk8

README.md

@@ -1,5 +1,6 @@
 # Socket.IO-client Java
-[![Build Status](https://travis-ci.org/socketio/socket.io-client-java.png?branch=master)](https://travis-ci.org/socketio/socket.io-client-java)
+
+[![Build Status](https://github.com/socketio/socket.io-client-java/workflows/CI/badge.svg)](https://github.com/socketio/socket.io-client-java/actions)
 
 This is the Socket.IO v1.x and v2.x Client Library for Java, which is simply ported from the [JavaScript client](https://github.com/socketio/socket.io-client).
 

src/test/java/io/socket/client/SSLConnectionTest.java

@@ -66,7 +66,7 @@ public class SSLConnectionTest extends Connection {
         TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
         tmf.init(ks);
 
-        SSLContext sslContext = SSLContext.getInstance("TLSv1");
+        SSLContext sslContext = SSLContext.getInstance("TLS");
         sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
 
         sOkHttpClient = new OkHttpClient.Builder()

src/test/resources/cert.pem

@@ -1,10 +1,21 @@
 -----BEGIN CERTIFICATE-----
-MIIBfDCCASYCCQDTnGd/oOyF1DANBgkqhkiG9w0BAQUFADBFMQswCQYDVQQGEwJB
-VTETMBEGA1UECBMKU29tZS1TdGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lkZ2l0
-cyBQdHkgTHRkMB4XDTE0MDcwNzEzMTUzN1oXDTQxMTEyMTEzMTUzN1owRTELMAkG
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-k/jRQ0q19PNPAgMBAAEwDQYJKoZIhvcNAQEFBQADQQCnmm1N/yZiMBZw2JDfbsx3
-ecc0BGQ2BwWQuGHzP07TMi1AuOyNZSczl907OphYb9iRC8shZ4O+oXjQAuGTQ1Hp
+MIIDazCCAlOgAwIBAgIUPRxvTroGehqqXb8XOvqliIcKyagwDQYJKoZIhvcNAQEL
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+XeFIZbJz/WoAo0ZJ6o8Y
 -----END CERTIFICATE-----

src/test/resources/key.pem

@@ -1,9 +1,28 @@
------BEGIN RSA PRIVATE KEY-----
-MIIBOwIBAAJBALqx14U+WqTk9qn3CgXHVE7TmAuJ3Dgw1wv5lFLHL+w14Tg+FP9E
-sVwS+deIdz3bBPxgHln5YIyT+NFDSrX0808CAwEAAQJAIdwLSIEsk2drTRwe1zl1
-ku5RTxZruE0zU1qqifDSQjab1StAK1tapxBVRlRlyLCfD704UClsU8sjGtq0Nh6n
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-wwuD4hibV+b6I8CLYoyPBo32EaceN0sCIQCUed6NxfM/houlgV+Xtmfcnzv9X3yx
-EDdzjpz08Q7sRQIgZFv1fBOYYSBXQppnJRFzx2pUmCvDHtrTrMh84RfIqnsCIQCf
-JjNXXxOaHn1PNZpi6EHReiFQmy1Swt+AxpTsKixsfA==
------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----
+MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCxJ8fUV6sRiNub
+3Af6jGpGTsWpCqtxBkRSADENMzdTTwz4wUXXbgv/Tbt3XJovR1RtE9nx+WyA4XqB
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+2oxN1xfkQYQ9cLYTAOfrDw==
+-----END PRIVATE KEY-----