composer.json: Specify a specific version of PHPUnit to use (~4.5)

Using * will use the latest compatible version, which could potentially
introduce breaking changes. ~4.5 is equivalent to >=4.5,<5.0

Change-Id: I65bf0998cc028707f607ce7adaf45e27b1e6bca1

diff --git a/composer.json b/composer.json
index bae3b55..94bec94 100644 (file)
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
        },
        "require-dev": {
                "justinrainbow/json-schema": "~1.3",
-               "phpunit/phpunit": "*"
+               "phpunit/phpunit": "~4.5"
        },
        "suggest": {
                "ext-fileinfo": "*",