Update README.md
Updates typo from 4 to 2 digit year formatting.
@@ -229,7 +229,7 @@ If you set '`"days_between_snapshots": 0`', then the add-on won't try to create
The config option `snapshot_name` can be changed to give snapshots a different name or with a date format of your choosing. The default is `{type} Snapshot {year}-{month}-{day} {hr24}:{min}:{sec}`, which makes snapshots with a name like `Full Snapshot 2019-10-31 14:00:00`. Using the settings menu in the Web UI, you can see a preview of what a snapshot name will look like but you can also set it in the add-on's options. Below is the list of variables you can add to modify the name to your liking.
* `{type}`: The type of snapshot, either 'Full' or 'Partial'
* `{year}`: Year in 4 digit format (eg 2019)
-* `{year_short}`: Year in 4 digit format (eg 19)
+* `{year_short}`: Year in 2 digit format (eg 19)
* `{weekday}`: Long day of the week (eg Monday, ..., Sunday)
* `{weekday_short}`: Short day of week (eg Mon, ... Sun)
* `{month}`: 2 digit month (eg 01, ... 12)
