Bump shortid from 2.2.8 to 2.2.15

Bumps [shortid](https://github.com/dylang/shortid) from 2.2.8 to 2.2.15.
- [Release notes](https://github.com/dylang/shortid/releases)
- [Changelog](https://github.com/dylang/shortid/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dylang/shortid/compare/2.2.8...2.2.15)

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

package-lock.json

@@ -5200,6 +5200,11 @@
       "integrity": "sha512-bAdJv7fBLhWC+/Bls0Oza+mvTaNQtP+1RyhhhvD95pgUJz6XM5IzgmxOkItJ9tkoCiplvAnXI1tNmmUD/eScyA==",
       "optional": true
     },
+    "nanoid": {
+      "version": "2.1.11",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-2.1.11.tgz",
+      "integrity": "sha512-s/snB+WGm6uwi0WjsZdaVcuf3KJXlfGl2LcxgwkEwJF0D/BWzVWAZW/XY4bFaiR7s0Jk3FPvlnepg1H1b1UwlA=="
+    },
     "nanomatch": {
       "version": "1.2.9",
       "resolved": "https://registry.npmjs.org/nanomatch/-/nanomatch-1.2.9.tgz",
@@ -7006,9 +7011,12 @@
       }
     },
     "shortid": {
-      "version": "2.2.8",
-      "resolved": "https://registry.npmjs.org/shortid/-/shortid-2.2.8.tgz",
-      "integrity": "sha1-AzsRfWoul1gE9vCWnb59PQs1UTE="
+      "version": "2.2.15",
+      "resolved": "https://registry.npmjs.org/shortid/-/shortid-2.2.15.tgz",
+      "integrity": "sha512-5EaCy2mx2Jgc/Fdn9uuDuNIIfWBpzY4XIlhoqtXF6qsf+/+SGZ+FxDdX/ZsMZiWupIWNqAEmiNY4RC+LSmCeOw==",
+      "requires": {
+        "nanoid": "^2.1.0"
+      }
     },
     "side-channel": {
       "version": "1.0.2",

package.json

@@ -53,7 +53,7 @@
     "pico-router": "^2.1.0",
     "react": "^16.12.0",
     "react-dom": "^16.3.3",
-    "shortid": "^2.2.4",
+    "shortid": "^2.2.15",
     "superagent": "^5.2.1",
     "vitreum": "^4.10.1"
   },