Add BIP174 dependency

package-lock.json

@@ -199,6 +199,11 @@
         "file-uri-to-path": "1.0.0"
       }
     },
+    "bip174": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/bip174/-/bip174-0.0.4.tgz",
+      "integrity": "sha512-KirRr35qCNih51thdf6klTevFTtm/cIw2iqumRgxtqFjNREFG78fFylfCkMM9aQdlYfSoj3sczxgXham0jZVnw=="
+    },
     "bip32": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/bip32/-/bip32-2.0.3.tgz",

package.json

@@ -47,6 +47,7 @@
   "dependencies": {
     "@types/node": "10.12.18",
     "bech32": "^1.1.2",
+    "bip174": "0.0.4",
     "bip32": "^2.0.3",
     "bip66": "^1.1.0",
     "bitcoin-ops": "^1.4.0",