Update issue templates

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Mistake
+about: Create a report to help us improve
+
+---
+
+**Describe the mistake**
+A clear and concise description of what the mistake is.
+
+**Location**
+Please provide the 
+1. version (bottom of page)
+2. Chapter
+3. page
+4. line number/equation number
+
+**Proposed solution**
+A clear and concise description of what you would like to change.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.