Use npmignore file instead of files array

.npmignore

@@ -0,0 +1,9 @@
+src
+build
+.editorconfig
+.eslintrc.json
+.gitignore
+.travis.yml
+rollup.config.dev.js
+rollup.config.js
+yarn-error.log

package.json

@@ -6,11 +6,6 @@
   "bin": {
     "distill-render": "./bin/render.js"
   },
-  "files": [
-    "dist",
-    "bin",
-    "examples"
-  ],
   "author": "Shan Carter",
   "homepage": "https://github.com/distillpub/distill-template#readme",
   "bugs": {