other chart types (dual axea, etc)

[todo]

antv-spec/src/adaptor/g2plot/toConfig.ts

Lines 50 to 55 in c473d0c

	// TODO: other chart types (dual axea, etc)
	return '';
	}
	/**
	* translate antv-spec to g2plot configuration

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This issue was generated by todo based on a TODO comment in c473d0c when #18 was merged. cc @antvis.