[enh] Update dependencies

package.json

@@ -4,7 +4,7 @@
   "main": "index.js",
   "license": "MIT",
   "scripts": {
-    "install": "tsc"
+    "install": "tsc --skipLibCheck"
   },
   "dependencies": {
     "express": "^4.16.4",
@@ -22,7 +22,7 @@
     "@types/request-promise": "^4.1.42",
     "@types/should": "^13.0.0",
     "assert": "^1.4.1",
-    "duniter": "https://git.duniter.org/nodes/typescript/duniter.git",
+    "duniter": "1.7.21",
     "mocha": "^5.2.0",
     "request": "^2.88.0",
     "request-promise": "^4.2.2",