Update the phpseclib via composer.

libraries/vdm_io/vendor/composer/installed.json

@@ -1,17 +1,17 @@
 [
     {
         "name": "phpseclib/phpseclib",
-        "version": "2.0.10",
-        "version_normalized": "2.0.10.0",
+        "version": "2.0.21",
+        "version_normalized": "2.0.21.0",
         "source": {
             "type": "git",
             "url": "https://github.com/phpseclib/phpseclib.git",
-            "reference": "d305b780829ea4252ed9400b3f5937c2c99b51d4"
+            "reference": "9f1287e68b3f283339a9f98f67515dd619e5bf9d"
         },
         "dist": {
             "type": "zip",
-            "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/d305b780829ea4252ed9400b3f5937c2c99b51d4",
-            "reference": "d305b780829ea4252ed9400b3f5937c2c99b51d4",
+            "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/9f1287e68b3f283339a9f98f67515dd619e5bf9d",
+            "reference": "9f1287e68b3f283339a9f98f67515dd619e5bf9d",
             "shasum": ""
         },
         "require": {
@@ -29,7 +29,7 @@
             "ext-mcrypt": "Install the Mcrypt extension in order to speed up a few other cryptographic operations.",
             "ext-openssl": "Install the OpenSSL extension in order to speed up a wide variety of cryptographic operations."
         },
-        "time": "2018-02-19T04:29:13+00:00",
+        "time": "2019-07-12T12:53:49+00:00",
         "type": "library",
         "installation-source": "dist",
         "autoload": {