Bump lodash from 4.17.15 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.15...4.17.21)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -12,6 +12,17 @@
         "asteroid": "github:rocketchat/asteroid#a76a53254e381f9487aa2a9be3d874c9a2df6552",
         "lru-cache": "^4.1.1",
         "node-rest-client": "^3.1.0"
+      },
+      "dependencies": {
+        "asteroid": {
+          "version": "github:rocketchat/asteroid#a76a53254e381f9487aa2a9be3d874c9a2df6552",
+          "from": "github:rocketchat/asteroid",
+          "requires": {
+            "ddp.js": "^0.5.0",
+            "faye-websocket": "^0.11.0",
+            "q": "^1.0.1"
+          }
+        }
       }
     },
     "@types/lru-cache": {
@@ -24,15 +35,6 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-9.6.52.tgz",
       "integrity": "sha512-d6UdHtc8HKe3NTruj9mHk2B8EiHZyuG/00aYbUedHvy9sBhtLAX1gaxSNgvcheOvIZavvmpJYlwfHjjxlU/Few=="
     },
-    "asteroid": {
-      "version": "github:rocketchat/asteroid#a76a53254e381f9487aa2a9be3d874c9a2df6552",
-      "from": "github:rocketchat/asteroid",
-      "requires": {
-        "ddp.js": "^0.5.0",
-        "faye-websocket": "^0.11.0",
-        "q": "^1.0.1"
-      }
-    },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
@@ -313,9 +315,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.15",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
-      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A=="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "lru-cache": {
       "version": "4.1.5",