chore: adds files section in package.json (cloudevents#147)

Signed-off-by: Helio Frota <00hf11@gmail.com>

Author: helio-frota

Diff for: package.json

@@ -13,6 +13,11 @@
     "coverage-publish": "wget -qO - https://coverage.codacy.com/get.sh | bash -s report -l JavaScript -r coverage/lcov.info",
     "release": "standard-version"
   },
+  "files": [
+    "lib",
+    "v03",
+    "v1"
+  ],
   "standard-version": {
     "types": [
       {