docs: update readme

Author: hustcc

README.md

@@ -11,24 +11,31 @@ This is a TypeScript-based MCP server that provides chart generation capabilitie
 
 ## ✨ Features
 
-Now 15+ charts supported.
+Now 20+ charts supported.
 
 <img width="640" alt="mcp-server-chart preview" src="https://mdn.alipayobjects.com/huamei_qa8qxu/afts/img/A*ZlzKQKoJzsYAAAAAAAAAAAAAemJ7AQ/fmt.webp" />
 
 - `generate_area_chart` - Generate a `area` chart, and return an image URL.
 - `generate_bar_chart` - Generate a `bar` chart, and return an image URL.
+- `generate_boxplot_chart` - Generate a `boxplot` chart, and return an image URL. 
 - `generate_column_chart` - Generate a `column` chart, and return an image URL.
 - `generate_dual_axes_chart` - Generate a `dual-axes` chart, and return an image URL.
 - `generate_fishbone_diagram` - Generate a `fishbone-diagram` chart, and return an image URL.
 - `generate_flow_diagram` - Generate a `flow-diagram` chart, and return an image URL.
+- `generate_funnel_chart` - Generate a `funnel` chart, and return an image URL.
 - `generate_histogram_chart` - Generate a `histogram` chart, and return an image URL.
 - `generate_line_chart` - Generate a `line` chart, and return an image URL.
+- `generate_liquid_chart` - Generate a `liquid` chart, and return an image URL.
 - `generate_mind_map` - Generate a `mind-map` chart, and return an image URL.
 - `generate_network_graph` - Generate a `network-graph` chart, and return an image URL.
+- `generate_organization_chart` - Generate a `organization-chart` chart, and return an image URL.
 - `generate_pie_chart` - Generate a `pie` chart, and return an image URL.
 - `generate_radar_chart` - Generate a `radar` chart, and return an image URL.
+- `generate_sankey_chart` - Generate a `sankey` chart, and return an image URL.
 - `generate_scatter_chart` - Generate a `scatter` chart, and return an image URL.
 - `generate_treemap_chart` - Generate a `treemap` chart, and return an image URL.
+- `generate_venn_chart` - Generate a `venn` chart, and return an image URL.
+- `generate_violin_chart` - Generate a `violin` chart, and return an image URL.
 - `generate_word_cloud_chart` - Generate a `word-cloud` chart, and return an image URL.