Updating argum lib

Author: gershnik

dependencies.json

@@ -1,10 +1,10 @@
 {
     "argum": {
-        "version": "v2.7",
+        "version": "v2.8",
         "url": "https://github.com/gershnik/argum/tarball/${version}",
         "homepage": "https://github.com/gershnik/argum",
-        "sha256": "3c1c62aaac99f3fd56c768c12612cc64a0eb933685c0be38161888363ab45a3a",
-        "md5": "7a90d4aa35aba8ea5cd86044cba0df9d"
+        "sha256": "a65a9853d61d63929c1f3480598df9155f4263b3fc0ef9696d261c037f68e54e",
+        "md5": "924711c86a676f84ae581e24124ef681"
     },
     "asio": {
         "version": "1.36.0",