Update boot.js

if major, minor and patch are equal, the incoming wins.

boot/boot.js

@@ -375,8 +375,7 @@ $tw.utils.checkVersions = function(versionStringA,versionStringB) {
 	];
 	return (diff[0] > 0) ||
 		(diff[0] === 0 && diff[1] > 0) ||
-		(diff[0] === 0 && diff[1] === 0 && diff[2] > 0) ||
-		(diff[0] === 0 && diff[1] === 0 && diff[2] === 0 && !versionB.prerelease);
+		(diff[0] === 0 && diff[1] === 0 && diff[2] > 0);
 };
 
 /*