build(package.json): cleanup package step

Author: TimoBechtel

package.json

@@ -8,9 +8,9 @@
 	"unpkg": "dist/index.umd.js",
 	"types": "dist/index.d.ts",
 	"scripts": {
-		"build": "microbundle",
-		"dev": "microbundle watch",
-		"prepare": "npm run build",
+		"build": "microbundle --no-sourcemap",
+		"dev": "microbundle watch --no-sourcemap",
+		"prepack": "npm run build",
 		"test": "npm run build && node test/index.test.js"
 	},
 	"files": [