Set branch for self-update to "latest-release"

Since Git has renamed the default "master" to "main",
why not use the occasion to switch the naming to something
more revealing. This sets the repository free to rename develop
to main if desired at some point.

Author: j4yk

src/Squit.package/SquitBrowser.class/class/initializeSelfUpdate.st

@@ -1,4 +1,4 @@
 class initialization
 initializeSelfUpdate
 	"SquitBrowser initializeSelfUpdate"
-	SelfUpdateBranch := 'develop'.
+	SelfUpdateBranch := 'latest-release'.

src/Squit.package/SquitBrowser.class/methodProperties.json

@@ -2,7 +2,7 @@
 	"class" : {
 		"defaultTitle" : "fn 4/11/2017 17:23",
 		"initialize" : "jr 4/18/2018 21:28",
-		"initializeSelfUpdate" : "jr 4/18/2018 21:27",
+		"initializeSelfUpdate" : "jr 12/2/2020 19:41",
 		"open" : "fn 4/11/2017 09:09",
 		"registerInWorldMenu" : "jr 4/15/2017 13:34",
 		"selfUpdate" : "jr 3/7/2020 00:09",