Fix 5.1 Update version to 5.1.1

package.json

@@ -1,6 +1,6 @@
 {
   "name": "inversify",
-  "version": "5.1.0",
+  "version": "5.1.1",
   "description": "A powerful and lightweight inversion of control container for JavaScript and Node.js apps powered by TypeScript.",
   "main": "lib/inversify.js",
   "jsnext:main": "es/inversify.js",
@@ -16,7 +16,7 @@
     "test": "nyc --require ts-node/register mocha test/**/*.test.ts --reporter spec --retries 3 --require 'node_modules/reflect-metadata/Reflect.js' --exit",
     "test:browser": "browserify test/inversify.test.ts -p [ tsify --noImplicitAny ] > ./test/bundle.test.js && karma start",
     "publish-please": "publish-please",
-    "prepublish": "publish-please guard",
+    "prepublish": "npm run build && publish-please guard",
     "update": "updates --update && npm install",
     "postupdate": "git diff-files --quiet package-lock.json || npm test"
   },