Add files attr

Author: groenroos

package.json

@@ -22,6 +22,9 @@
     "nunjucks": "^3.2.3",
     "path": "^0.12.7"
   },
+  "peerDependencies": {
+    "@sapling/sapling": "^0.1.0"
+  },
   "devDependencies": {
     "@babel/core": "^7.13.10",
     "@babel/eslint-parser": "^7.13.10",
@@ -31,9 +34,6 @@
     "nyc": "^15.1.0",
     "xo": "^0.48.0"
   },
-  "peerDependencies": {
-    "@sapling/sapling": "^0.1.0"
-  },
   "scripts": {
     "precommit": "lint-staged",
     "lint-fix": "xo --fix",
@@ -42,6 +42,9 @@
     "test:report": "nyc --reporter=lcov npm test",
     "test:send": "npx codecov"
   },
+  "files": [
+    "index.js"
+  ],
   "xo": {
     "ignores": [
       "node_modules/**/*.*",