Fixed broken link

Updated the download link for the macOS build to a direct DMG file.

Author: rymuelle

README.md

@@ -103,8 +103,8 @@ Pending
 
 ### Download installer
 
-Download the macOS build here:
-[**RawRefinery v1.3.0-alpha**](https://github.com/rymuelle/RawRefinery/releases/download/v1.3.0-alpha)
+[Download the macOS build here.](https://github.com/rymuelle/RawRefinery/releases/download/v1.3.0-alpha/RawRefinery_v1.3.0.dmg)
+
 
 ---
 
@@ -179,4 +179,4 @@ With thanks to:
 
 > Chen, Liangyu; Chu, Xiaojie; Zhang, Xiangyu; Chen, Jianhao. (2022).
 > *NAFNet: Simple Baselines for Image Restoration.*
-> [https://doi.org/10.48550/arXiv.2208.04677](https://doi.org/10.48550/arXiv.2208.04677), arXiv, V1.
+> [https://doi.org/10.48550/arXiv.2208.04677](https://doi.org/10.48550/arXiv.2208.04677), arXiv, V1.