Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Issue tracker is ONLY used for reporting bugs.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Detailed Description
+<!--- Provide a detailed description of the change or addition you are proposing -->
+
+## Expected Behavior
+<!--- Tell us what should happen -->
+
+## Current Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Steps to Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Possible Implementation
+<!--- Not obligatory, but suggest an idea for implementing addition or change -->