mark incopatible with known unsafe phpunit versions

Author: gggeek

composer.json

@@ -12,13 +12,13 @@
         "ext-curl": "*",
         "ext-dom": "*",
         "ext-mbstring": "*",
-        "phpunit/phpunit": "^4.8 || ^5.0 || ^8.5.14",
+        "phpunit/phpunit": "^4.8.28 || ^5.6.3 || ^8.5.42",
         "phpunit/phpunit-selenium": "*",
         "yoast/phpunit-polyfills": "*"
     },
     "suggest": {
         "ext-curl": "Needed for HTTPS, HTTP2 and HTTP 1.1 support, NTLM Auth etc...",
-        "ext-zlib": "Needed for sending compressed requests and receiving compressed responses, if cURL is not available",
+        "ext-zlib": "Needed for sending compressed requests and receiving compressed responses, if CURL is not available",
         "ext-mbstring": "Needed to allow reception of requests/responses in character sets other than ASCII,LATIN-1,UTF-8",
         "phpxmlrpc/extras": "Adds more featured Server classes, including self-documenting and ajax-enabled servers",
         "phpxmlrpc/jsonrpc": "Adds support for the JSON-RPC protocol"