Fix issue with marker-end.

[gjlubbertsen]

I had issues with marker-end. Assuming that CSS got more strict over time.

Used mermaid inside docsify and had to fix the Css globaly:

<style>
  .messageLine0
  {
	marker-end: url(#arrowhead) !important;
	
  }
  .messageLine1
  {
	marker-end: url(#arrowhead) !important;
  }
  
  </style>

[coveralls]

Pull Request Test Coverage Report for Build 694

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 54.286%

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Totals
Change from base Build 671:	0.0%
Covered Lines:	2052
Relevant Lines:	3757

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💛 - Coveralls