Delete ISSUE_TEMPLATE.md

Not needed due to #90

ISSUE_TEMPLATE.md

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-## Actual behaviour
-<!--- Please describe what problem you have noticed -->
-
-## Expected behaviour
-<!--- Please describe what you expect to happen instead -->
-
-## Steps to reproduce the problem
-<!--- Explain step by step what you did when the problem occurs -->
-1. 
-2. 
-3. 
-
-## Specifications
-- Plattform: 
-- OS: 
-- Version:   <!--- if there is one -->