Reduce PHP requirement to 5.5

Author: plotbox-io

composer.json

@@ -12,8 +12,9 @@
   ],
   "minimum-stability": "stable",
   "require": {
-    "php": ">=5.6",
-    "ext-json": "*"
+    "php": ">=5.5",
+    "ext-json": "*",
+    "ext-dom": "*"
   },
   "autoload": {
     "psr-4": {

src/Phpcs/ReportType/CsvReport.php

@@ -3,6 +3,7 @@
 namespace PlotBox\PhpcsParse\Phpcs\ReportType;
 
 use PlotBox\PhpcsParse\CodeIssue;
+use RuntimeException;
 
 class CsvReport implements Report
 {
@@ -13,7 +14,7 @@ public function fromString($content)
     {
         $foundIssues = explode("\n", $content);
         if (preg_match('/^ERROR:/', $foundIssues[0])) {
-            throw new \RuntimeException($foundIssues[0]);
+            throw new RuntimeException($foundIssues[0]);
         }
 
         $parsedIssues = [];