Use 'require' instead of 'require_relative'
Add Draw module
Add circle method
Set layout to "neato" for circle method
Fix & Update circle method
Add ellipse method
Rewrite circle with ellipse
Add a spec for ellipse
Add rect method
Add square method
Add point and line methods
Fix height attr for circle method
Fix height attr for square method
Fix points color for line
Fix edge attributes for line method
Required Ruby version update
Add other shapes using define_method
Refactor methods for shapes
require graphviz_attrs before draw
Add description for Draw methods
Add description for Drawing
Fix image url for sample4