Allows drawing recursive relationships

[syou6162]

resolves #88

Description

This modification allows a diagram to be drawn even if it has the following recursive relationship.

erDiagram
  "MY_PROJECT.CATEGORY" {
  }
  "MY_PROJECT.CATEGORY" }|--|| "MY_PROJECT.CATEGORY": categoryid--parentCategoryId

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Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f704cf8) 100.00% compared to head (681134f) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #89   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        32           
  Lines          959       961    +2     
=========================================
+ Hits           959       961    +2     

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[datnguye]

LGTM thanks @syou6162