Release v1.2.0

- Explain Accessibility permission in README
- Bump version to 1.2.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

macos/Makefile

@@ -2,7 +2,7 @@
 
 APP_NAME = WhisperDictate
 APP_BUNDLE = $(APP_NAME).app
-VERSION = 1.1.0
+VERSION = 1.2.0
 
 # Directories
 SRC_DIR = src