chore: update libp2p-crypto (#161)

BREAKING CHANGE: requires node 15+

Author: achingbrain

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        node: [14, 16]
+        node: [16]
       fail-fast: true
     steps:
       - uses: actions/checkout@v2

package.json

@@ -30,7 +30,7 @@
   ],
   "license": "MIT",
   "engines": {
-    "node": ">=14.0.0"
+    "node": ">=15.0.0"
   },
   "bugs": {
     "url": "https://github.com/libp2p/js-peer-id/issues"
@@ -42,7 +42,7 @@
   },
   "dependencies": {
     "class-is": "^1.1.0",
-    "libp2p-crypto": "^0.20.0",
+    "libp2p-crypto": "^0.21.0",
     "multiformats": "^9.4.5",
     "protobufjs": "^6.10.2",
     "uint8arrays": "^3.0.0"