Update README.md

fix RenderFilename (#103)

add cmd/dot/go.mod file (#102)

update go.mod

update go.mod

add toDictWasm (#98)

Support image (#96)

* support image rendering

* support fixedsize attr

* add logo.png

support font (#94)

Support filled beziercurve rendering (#92)

* support filled beziercurve rendering
* fix testdata
* fix threshold

add cgraph setters for fontname (#89)