feat(deps): Remove uglify devDependency

As I recall, this was only added to mitigate issues with running `npm
ls` and correctly showing all dependencies installed (see
https://github.com/pelias/api/issues/1179).

package.json

@@ -78,8 +78,7 @@
     "source-map": "^0.7.0",
     "tap-dot": "^2.0.0",
     "tape": "^4.5.1",
-    "tmp": "^0.0.33",
-    "uglify-js": "^3.0.4"
+    "tmp": "^0.0.33"
   },
   "pre-commit": [
     "lint",