deps: remove wrappy from package.json (#27)

`wrappy` was previously added to dependencies in order to flatten it, but we no longer do legacy-style for npm itself, so this can go away.

PR-URL: #27
Credit: @rickschubert
Reviewed-By: @zkat

Author: rickschubert

Diff for: package.json

@@ -140,7 +140,6 @@
     "validate-npm-package-name": "~3.0.0",
     "which": "^1.3.1",
     "worker-farm": "^1.6.0",
-    "wrappy": "~1.0.2",
     "write-file-atomic": "^2.3.0"
   },
   "bundleDependencies": [
@@ -252,7 +251,6 @@
     "validate-npm-package-license",
     "validate-npm-package-name",
     "which",
-    "wrappy",
     "write-file-atomic",
     "safe-buffer",
     "worker-farm",