fix: bundling library using webpack

this change ensures "default" conditions are last, fixing the following
webpack bundling error:

```
Module not found: Error: Default condition should be last one
```

PR-URL: #190
Credit: @AviVahl
Close: #190
Reviewed-by: @isaacs

package.json

@@ -13,12 +13,12 @@
   "exports": {
     ".": {
       "import": {
-        "default": "./dist/mjs/index.js",
-        "types": "./dist/mjs/index.d.ts"
+        "types": "./dist/mjs/index.d.ts",
+        "default": "./dist/mjs/index.js"
       },
       "require": {
-        "default": "./dist/cjs/index.js",
-        "types": "./dist/cjs/index.d.ts"
+        "types": "./dist/cjs/index.d.ts",
+        "default": "./dist/cjs/index.js"
       }
     }
   },