docs: Add tail to the config example

Author: hogklint

README.md

@@ -72,19 +72,13 @@ if set. <!--*TODO* If both the environment variable and `--context` flag are pas
 You can use the config file to change the default values of tailfin options. The default config file path is
 `~/.config/tailfin/config.yaml`.
 
-```yaml
-# <flag name>: <value>
-max-log-requests: 999
-timestamps: short
-```
-<!-- TODO (tail)
 ```yaml
 # <flag name>: <value>
 tail: 10
 max-log-requests: 999
 timestamps: short
 ```
--->
+
 You can change the config file path with `--config` flag or `TAILFINCONFIG` environment variable.
 ### templates