Trigger cljs file reload if readable#3

Hi, can you please consider patch to consider cljs file for reloading if they are readable. It fixes #2. The previous implementation checked if the file was executable (X_OK), which caused: 1. Linux: An exception was always thrown, defaulting to returning true triggering file reload. 2. Windows: nil was returned, preventing file reloads. It seems to me the intention was to check for readability instead? This patch updates the logic accordingly. API: https://nodejs.org/api/fs.html#fsaccesssyncpath-mode Constants: https://nodejs.org/api/fs.html#file-access-constants old code: ```cljs (try (fs-sync/accessSync f fs-sync/constants.X_OK) (catch :default _e true)) ``` Since no test suite is available, I have manually tested this change command: ```powershell > npx josh Serving ./ on port 8000: - http://192.168.1.100:8000 - http://127.0.0.1:8000 SSE connection established SSE connection closed SSE connection established Frontend reloading: .#main.cljs Frontend reloading: main.cljs ``` console: ``` Josh Scittle re-loader installed [scittle.min.js:323:125](https://cdn.jsdelivr.net/npm/scittle@latest/dist/scittle.min.js) Reloading http://localhost:8000/main.cljs ``` I've also took the liberty to make the `scripts` > `prepare` unix specific command conditional skipping it on windows. Thanks