Bump version to 0.2.0

Breaking: JrxNode is now a union type (JrxElement | null | undefined),
isJrxNode renamed to isJrxElement.

Co-authored-by: Ona <no-reply@ona.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@nym.sh/jrx",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "license": "MIT",
   "publishConfig": {
     "access": "public"