eslint and minor fixes.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "0.12.1",
+  "version": "0.12.2",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",
@@ -12,7 +12,6 @@
     "browserify-cipher": ">=1",
     "buffer": ">=5",
     "create-hash": "^1.2.0",
-    "create-hmac": ">=1",
     "dns-packet": "^5.2.4",
     "micro-bip39": "^0.1.3",
     "randombytes": ">=2",
@@ -30,5 +29,9 @@
     "censorship",
     "censorship-resistance",
     "client"
-  ]
+  ],
+  "devDependencies": {
+    "eslint": "^8.5.0",
+    "eslint-plugin-babel": "^5.3.1"
+  }
 }