Removed unused dependency

backend/package-lock.json

@@ -2169,14 +2169,6 @@
       "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
       "integrity": "sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E="
     },
-    "merge-files": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/merge-files/-/merge-files-0.1.2.tgz",
-      "integrity": "sha512-WTvtH6ZwVy1/scvp1M+Re6PVni87QTjpSLAwxh0L+PlYIxc4VGFFpLjvP7jdJ43gaJ5n+RUIriJ6wKqmqvVVmg==",
-      "requires": {
-        "multistream": "^2.1.0"
-      }
-    },
     "merge-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
@@ -2428,31 +2420,6 @@
         "xtend": "^4.0.0"
       }
     },
-    "multistream": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/multistream/-/multistream-2.1.1.tgz",
-      "integrity": "sha512-xasv76hl6nr1dEy3lPvy7Ej7K/Lx3O/FCvwge8PeVJpciPPoNCbaANcNiBug3IpdvTveZUcAV0DJzdnUDMesNQ==",
-      "requires": {
-        "inherits": "^2.0.1",
-        "readable-stream": "^2.0.5"
-      },
-      "dependencies": {
-        "readable-stream": {
-          "version": "2.3.7",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
-          "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
-          "requires": {
-            "core-util-is": "~1.0.0",
-            "inherits": "~2.0.3",
-            "isarray": "~1.0.0",
-            "process-nextick-args": "~2.0.0",
-            "safe-buffer": "~5.1.1",
-            "string_decoder": "~1.1.1",
-            "util-deprecate": "~1.0.1"
-          }
-        }
-      }
-    },
     "mz": {
       "version": "2.7.0",
       "resolved": "https://registry.npmjs.org/mz/-/mz-2.7.0.tgz",