Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Use this template if you believe you've encountered a bug.
+title: ''
+labels: bug
+assignees: K4YT3X
+
+---
+
+## Environment Information
+
+|Module|Version|
+|-|-|
+|`video2x`||
+|`ffmpeg`||
+|`waifu2x-caffe`||
+|`waifu2x-converter-cpp`||
+
+## Symptom
+
+Briefly describe what's going on.
+
+## Screenshots or Error Messages
+
+Please paste screenshots or error messages here.
+Include as much details as you can, as this greatly helps debugging the problem.
+
+Please paste your error message in the code block down below:
+
+```
+```

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Request a new feature to be added
+title: ''
+labels: enhancement
+assignees: K4YT3X
+
+---
+
+## Description
+
+Briefly describe the feature you want to be added into `video2x`.
+
+## Sources
+
+Paste links to descriptions of related documentations, websites and etc. here.