Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Create a report about a bug inside the library or issues with the documentation
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+QUESTIONS ARE NOT BUGS AND DON'T BELONG HERE.
+
+If you have a question, ask in https://stackoverflow.com or find the link for the Telegram group in the description of https://t.me/TelethonUpdates.
+
+**Checklist**
+* [ ] The error is in the library's code, and not in my own.
+* [ ] I have searched for this issue before posting it and there isn't a duplicate.
+* [ ] I ran `pip install -U https://github.com/LonamiWebs/Telethon/archive/master.zip` and triggered the bug in the latest version.
+
+**Code that causes the issue**
+```python
+from telethon.sync import TelegramClient
+...
+
+```
+
+**Traceback**
+```
+Traceback (most recent call last):
+  File "code.py", line 1, in <code>
+
+```