Add `make lint` and specify as self-hosted

Makefile

@@ -1,5 +1,8 @@
-all: *.json *.js img/* *.md *.txt
+all:
 	zip -r bitbucket-fork-redirect.zip * -x '.git/*' -x 'server/*' -x 'node_modules/*' -x img/screenshot.png -x .gitignore -x Makefile
 
+lint:
+	npm run lint
+
 clean:
 	rm *.zip

package.json

@@ -4,7 +4,7 @@
   "description": "An extension with a few convenience features for bitbucket server",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "lint": "make all && addons-linter bitbucket-fork-redirect.zip"
+    "lint": "make all && addons-linter --self-hosted bitbucket-fork-redirect.zip"
   },
   "repository": {
     "type": "git",