use phpseclib3

Author: terrafrost

composer.json

@@ -23,7 +23,7 @@
         "source":   "https://github.com/phpseclib/bcmath_compat"
     },
     "require": {
-        "phpseclib/phpseclib": "dev-master"
+        "phpseclib/phpseclib": "^3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.35|^5.7|^6.0|^9.4",