Setup TravisCI

.travis.yml

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+language: php
+
+php:
+  - '7.1'
+  - '7.2'
+  - nightly
+
+env:
+  matrix:
+    - PREFER_LOWEST="--prefer-lowest --prefer-stable"
+    - PREFER_LOWEST=""
+
+before_install:
+- composer install --dev
+
+before_script: 
+- composer update $PREFER_LOWEST
+- curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+- chmod +x ./cc-test-reporter 
+- ./cc-test-reporter before-build
+
+script:
+- ./vendor/bin/phpunit --coverage-clover ./build/logs/clover.xml --configuration phpunit-travis.xml
+
+after_script: 
+- mv build/logs/clover.xml clover.xml 
+- ./cc-test-reporter after-build --coverage-input-type clover --id $CODECLIMATE_REPO_TOKEN --exit-code $TRAVIS_TEST_RESULT

phpunit-travis.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="vendor/autoload.php"
+         backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         verbose="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false">
+    <testsuites>
+        <testsuite name="Package">
+            <directory suffix=".php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory>src/</directory>
+        </whitelist>
+    </filter>
+</phpunit>