Update dependency constaints

Author: shalvah

composer.json

@@ -7,7 +7,6 @@
     "markdown"
   ],
   "license": "MIT",
-  "minimum-stability": "dev",
   "autoload": {
     "files": [
       "helpers.php"
@@ -35,10 +34,13 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^9.1",
-    "league/flysystem": "^2.0",
+    "league/flysystem": "^2.0@dev",
     "ext-dom": "*",
     "ext-libxml": "*"
   },
+  "replace": {
+    "mpociot/documentarian": "*"
+  },
   "scripts": {
     "test": "phpunit --stop-on-failure",
     "test-ci": "vendor/bin/phpunit"