Update travis build

Simplified test method for compatibility with older PHPUnit versions.

.travis.yml

@@ -1,14 +1,16 @@
-sudo: false
+os: linux
 
 language: php
 
 php:
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
+  - 7.4
   - nightly
 
-matrix:
+jobs:
   allow_failures:
     - php: nightly
   fast_finish: true
@@ -27,12 +29,12 @@ before_install:
 
 install:
   - composer update -n --prefer-dist
-  - wget https://github.com/php-coveralls/php-coveralls/releases/download/v1.0.2/coveralls.phar
-  - chmod +x coveralls.phar
 
 script:
   - phpdbg -qrr vendor/bin/phpunit --coverage-text --coverage-clover build/logs/clover.xml
   - PHP_CS_FIXER_IGNORE_ENV=1 php vendor/bin/php-cs-fixer --diff --dry-run -v fix
 
 after_script:
-  - ./coveralls.phar
+  - wget https://github.com/php-coveralls/php-coveralls/releases/download/v2.2.0/php-coveralls.phar
+  - chmod +x php-coveralls.phar
+  - travis_retry ./php-coveralls.phar -v

test/RetryConnectorTest.php

@@ -68,7 +68,7 @@ public function testFailingConnect(): \Generator
             ->getMockForAbstractClass();
 
         $this->expectException(ConnectionException::class);
-        $this->expectExceptionMessageMatches('/Could not connect to database server at (.+):\d+ after \d+ tries/');
+        $this->expectExceptionMessage('Could not connect to database server');
 
         $connection = yield $retry->connect($config);
     }