Add some line breaks in the upgrade error message

Author: hinerm

src/main/java/net/imagej/ui/swing/updater/LauncherMigrator.java

@@ -368,14 +368,14 @@ private void switchToNewLauncher() {
 				if (log != null) {
 					Path cfgPath = appDir.toPath().resolve(
 						Paths.get("config", "jaunch", appSlug + ".cfg"));
-					log.warn("Congratulations on upgrading Java. Unfortunately, " +
+					log.warn("Congratulations on upgrading Java.\n\tUnfortunately, " +
 						"the Java version chosen by the new launcher after the upgrade " +
 						"is " + nljv + ", which is still less than the recommended Java " +
-						"version of " + Java.recommendedVersion() + ". This should not " +
-						"be the case of course; it seems to be a bug. Would you please " +
-						"visit https://forum.image.sc/ and report this problem? Click " +
+						"version of " + Java.recommendedVersion() + ".\n\tThis should not " +
+						"be the case of course; it seems to be a bug.\n\tWould you please " +
+						"visit https://forum.image.sc/ and report this problem?\n\tClick " +
 						"'New Topic', choose 'Usage & Issues' category, and use tag '" +
-						appSlug + "'. To fix it locally for now, you can try editing the " +
+						appSlug + "'.\n\tTo fix it locally for now, you can try editing the " +
 						cfgPath + " file by hand to point to a newer Java installation.");
 				}
 				return;