Apply "visibility_required" CS rule to constants

php-cs-fixer fix --rules='{"visibility_required": ["property", "method", "const"]}'

Author: nicolas-grekas

Dotenv.php

@@ -25,9 +25,9 @@
  */
 final class Dotenv
 {
-    const VARNAME_REGEX = '(?i:[A-Z][A-Z0-9_]*+)';
-    const STATE_VARNAME = 0;
-    const STATE_VALUE = 1;
+    public const VARNAME_REGEX = '(?i:[A-Z][A-Z0-9_]*+)';
+    public const STATE_VARNAME = 0;
+    public const STATE_VALUE = 1;
 
     private $path;
     private $cursor;