Update README.md

README.md

@@ -39,8 +39,9 @@ VTracer and its [core library](//github.com/visioncortex/visioncortex) is implem
 ![screenshot](docs/images/screenshot-02.png)
 
 ## Command Line
-```
-visioncortex VTracer                                                                                                      
+
+```sh
+visioncortex VTracer 0.3.0
 A cmd app to convert images into vector graphics.
 
 USAGE:
@@ -56,6 +57,9 @@ OPTIONS:
     -c, --corner_threshold <corner_threshold>    Minimum momentary angle (degree) to be considered a corner
     -f, --filter_speckle <filter_speckle>        Discard patches smaller than X px in size
     -g, --gradient_step <gradient_step>          Color difference between gradient layers
+        --hierarchical <hierarchical>
+            Hierarchical clustering `stacked` (default) or non-stacked `cutout`. Only applies to color mode.
+
     -i, --input <input>                          Path to input raster image
     -m, --mode <mode>                            Curver fitting mode `pixel`, `polygon`, `spline`
     -o, --output <output>                        Path to output vector graphics