build: Update phpunit to 4.8.31

Please see changelog at
https://github.com/sebastianbergmann/phpunit/blob/4.8/ChangeLog-4.8.md

Change-Id: I00e0b94452b371cacecc4eb10330749c0da1890e

diff --git a/composer.json b/composer.json
index f57b9ce..8e98710 100644 (file)
--- a/composer.json
+++ b/composer.json
@@ -53,7 +53,7 @@
                "monolog/monolog": "~1.18.2",
                "nikic/php-parser": "2.1.0",
                "nmred/kafka-php": "0.1.5",
-               "phpunit/phpunit": "4.8.24",
+               "phpunit/phpunit": "4.8.31",
                "wikimedia/avro": "1.7.7"
        },
        "suggest": {