Update issue templates [CI SKIP]

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps and data to reproduce the behavior:
+
+Specifically, which version of salmon, which reference (e.g. transcriptome), which read files and which program options.
+
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots or terminal output to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. Ubuntu Linux, OSX]
+ - Version [ If you are on OSX, the output of `sw_vers`. If you are on linux the output of `uname -a` and `lsb_release -a`]
+
+**Additional context**
+Add any other context about the problem here.