Update issue templates

Issue reporting template for bug reports. Ask users to supply log file when reporting bugs to provide necessary information to us.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: kbseah
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+Please attach/copy the following:
+
+ - [ ] The command that resulted in the error
+ - [ ] The log file from the BleTIES run (default name: `bleties.log`)
+ - [ ] Any error messages that appeared on the console
+
+**Version info (please complete the following information):**
+ - [ ] OS: [e.g. Linux, Mac OS X]
+ - [ ] BleTIES version [output of `bleties --version`, e.g. 0.1.9]
+ - [ ] How you installed BleTIES [e.g. with Conda, from GitHub source code]