Update issue templates

Author: bartnv

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,18 @@
+---
+name: Bug report
+about: Report incorrect/unexpected conversion results
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+> To report incorrect/unexpected results, please attach a ZIP to this issue containing the YAML file and the input XML file you are using. Please trim the XML down to only the relevant part that triggers the bug and make sure no sensitive data remains inside. Then answer the questions below.
+
+1. Which version of `xml-to-postgres` are you using? (Release version or git commit hash)
+
+{your answer here}
+
+2. Please describe how the output is different from what you expect.
+
+{your answer here}