Update dependencies to latest versions

Skip update of shouldjs to avoid breaking tests in connectors.

package.json

@@ -42,14 +42,14 @@
     "eslint-config-loopback": "^11.0.0",
     "loopback-connector-throwing": "file:./test/fixtures/loopback-connector-throwing",
     "mocha": "^5.2.0",
-    "nyc": "^12.0.2",
+    "nyc": "^13.1.0",
     "should": "^8.4.0",
-    "typescript": "^2.8.3"
+    "typescript": "^3.2.2"
   },
   "dependencies": {
     "async": "^2.6.0",
-    "debug": "^3.1.0",
-    "depd": "^1.0.0",
+    "debug": "^4.1.0",
+    "depd": "^2.0.0",
     "inflection": "^1.6.0",
     "lodash": "^4.17.4",
     "loopback-connector": "^4.4.0",