fix: conditional exports in package.json

The exports need to reference valid file paths _after_ the build, not
before it.
That they were invalid broke usage, at least with Vite.
This commit resolves #504.

package.json

@@ -24,8 +24,8 @@
 		"Philipp Tailor (http://schneiders.space)"
 	],
 	"exports": {
-		"import": "./index.js",
-		"default": "./index.js"
+		"import": "./dist/index.mjs",
+		"default": "./dist/index.js"
 	},
 	"main": "dist/index.js",
 	"module": "dist/index.mjs",