Update ISSUE_TEMPLATE.md and PULL_REQUEST_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+## Step 1: Have you search for this issue before posting it?
+
+If you have discovered a bug in the bot, please [search our issue tracker](https://github.com/gcarq/freqtrade/issues?q=is%3Aissue). 
+If it hasn't been reported, please create a new issue.
+
+## Step 2: Describe your environment
+
+  * Python Version: _____ (`python -V`)
+  * Branch: Master | Develop
+  * Last Commit ID: _____ (`git log --format="%H" -n 1`)
+ 
+## Step 3: Describe the problem:
+*Explain the problem you have encountered*
+
+### Steps to reproduce:
+
+  1. _____
+  2. _____
+  3. _____
+  
+### Observed Results:
+
+  * What happened?
+  * What did you expect to happen?
+
+### Relevant code exceptions or logs:
+
+  ```
+  // paste your log here
+  ```

.github/PULL_REQUEST_TEMPLATE.md

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+Thank you for sending your pull request. But first, have you included
+unit tests, and is your code PEP8 conformant? [More details](https://github.com/gcarq/freqtrade/blob/develop/CONTRIBUTING.md)
+
+## Summary
+Explain in one sentence the goal of this PR
+
+Solve the issue: #___
+
+## Quick changelog
+
+- <change log #1>
+- <change log #2>
+
+## What's new?
+*Explain in details what this PR solve or improve. You can include visuals.*