update README
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@ -222,7 +222,7 @@ Function prefix mapping
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Rendering Routes With Graphviz Support
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Rendering Routes With Graphviz
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---------------------------------------
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The `r3_tree_render_file` API let you render the whole route trie into a image.
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@ -293,7 +293,7 @@ int r3_tree_render_file(const node * tree, const char * format, const char * fil
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```
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JSON Output Support
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JSON Output
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----------------------------------------
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You can render the whole tree structure into json format output.
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