Update issue templates (#4116)

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -0,0 +1,24 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+### Relevant telegraf.conf:
+
+### System info:
+
+[Include Telegraf version, operating system name, and other relevant details]
+
+### Steps to reproduce:
+
+1. ...
+2. ...
+
+### Expected behavior:
+
+### Actual behavior:
+
+### Additional info:
+
+[Include gist of relevant config, logs, etc.]

.github/ISSUE_TEMPLATE/Feature_request.md

@@ -0,0 +1,17 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+## Feature Request
+
+Opening a feature request kicks off a discussion.
+
+### Proposal:
+
+### Current behavior:
+
+### Desired behavior:
+
+### Use case: [Why is this important (helps with prioritizing requests)]