Update issue templates

Author: leszekhanusz

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Common problems**
+- If you receive a TransportQueryError, it means the error is coming from the backend (See [Error Handling](https://gql.readthedocs.io/en/latest/advanced/error_handling.html)) and has probably nothing to do with gql
+- If you use IPython (Jupyter, Spyder), then [you need to use the async version](https://gql.readthedocs.io/en/latest/async/async_usage.html#ipython)
+- Before sending a bug report, please consider [activating debug logs](https://gql.readthedocs.io/en/latest/advanced/logging.html) to see the messages exchanged between the client and the backend
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+Please provide a full stack trace if you have one.
+If you can, please provide the backend URL, the GraphQL schema, the code you used.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**System info (please complete the following information):**
+ - OS:
+ - Python version:
+ - gql version:
+ - graphql-core version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+