Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: This info is necessary to expedite fix
+
+---
+
+1. There are many types of RINEX files.
+     Almost every issue is because of some corner case with a particular RINEX format.
+     Thus we will usually need a copy of your RINEX file.
+     If it's very large/private, consider copying just the part of it that causes the issue for you.
+
+2. Please copy and paste the error--usually just the bottom couple lines is enough.