fix: remove useless sourcemap url (fixes #43) (#44)

Author: tjx666

package.json

@@ -45,7 +45,9 @@
   },
   "scripts": {
     "prepare": "npm run build",
-    "build": "rollup -c && npm run tsc",
+    "bundle": "rollup -c",
+    "build": "npm run bundle && npm run tsc",
+    "build:debug": "npm run bundle -- -m && npm run tsc",
     "lint": "eslint .",
     "tsc": "tsc",
     "tsd": "tsd",

rollup.config.js

@@ -3,7 +3,6 @@ export default {
     treeshake: false,
     output: {
         format: "cjs",
-        file: "dist/eslint-visitor-keys.cjs",
-        sourcemap: true
+        file: "dist/eslint-visitor-keys.cjs"
     }
 };