chore: make CI run as non-root (#20)

* chore: make CI run as non-root

Hopefully this will fix the auto-NPM-publishing. Currently the `prepare`
phase fails.

* up the version to 0.3.1

* add `files` stanza in package.json

.circleci/config.yml

@@ -3,9 +3,6 @@
 unit_tests: &unit_tests
   steps:
     - checkout
-    - run:
-        name: Configure npm to allow running scripts as root.
-        command: npm config set unsafe-perm true
     - run:
         name: Install modules and dependencies.
         command: npm install
@@ -54,23 +51,28 @@ jobs:
   node4:
     docker:
       - image: node:4
+        user: node
     <<: *unit_tests
   node6:
     docker:
       - image: node:6
+        user: node
     <<: *unit_tests
   node8:
     docker:
       - image: node:8
+        user: node
     <<: *unit_tests
   node9:
     docker:
       - image: node:9
+        user: node
     <<: *unit_tests
 
   publish_npm:
     docker:
       - image: node:8
+        user: node
     steps:
       - checkout
       - run:

package.json

@@ -1,11 +1,17 @@
 {
   "name": "js-green-licenses",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "JavaScript package.json license checker",
   "main": "build/src/checker.js",
   "bin": {
     "jsgl": "build/src/cli.js"
   },
+  "files": [
+    "CONTRIBUTING.md",
+    "LICENSE",
+    "README.md",
+    "build/src"
+  ],
   "types": "build/src/checker",
   "scripts": {
     "test": "nyc ava",