feature #3 Allow v2.0 of hidden string (sstok)

This PR was merged into the main branch.

Discussion
----------

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Fixed tickets | 
| License       | MPLv2.0




Commits
-------

2c307d3 Allow v2.0 of hidden string

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=7.2",
         "paragonie/constant_time_encoding": "^2.2",
-        "paragonie/hidden-string": "^1.0",
+        "paragonie/hidden-string": "^1.0 || ^2.0",
         "paragonie/sodium_compat": "^1.8"
     },
     "require-dev": {

phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/7.2/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
          bootstrap="vendor/autoload.php"
          beStrictAboutOutputDuringTests="true"
          beStrictAboutTodoAnnotatedTests="true"