Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: When something isn't working as expected
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**What is going on?**
+What's wrong with the library? What unexpected does it do?
+
+**Steps to reproduce**
+Please paste a short version of your code or describe your actions precisely.
+
+**Expected behavior**
+What did you expect the library to do?
+
+**Version info**
+* Python version: x.xx.x
+* Fixedcal version: x.x.x
+
+**Additional context**
+Any other information that may be related to this bug.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: When something could be added
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe how you would like the library to work**
+Write some example code or explain verbally what should be added.