Updated release notes for 1.4.0

ReleaseNotes/1.4.0.html

@@ -1,3 +1,7 @@
 Fixes/Features in 1.4.0:
 
-*
+* Multiple windows and tabs using macOS's native tab support!
+* Saved requests list is now part of each main window rather than a drawer (the drawer concept seems to be poorly supported in today's macOS libraries). 
+* New keymappings: Command-N opens a new window, Command-T opens a new tab, and Command-O opens the saved request name searcher. 
+* Bottom status bar looks slightly classier.
+* Enabling or disabling trust of self-signed certs is now a menu option.