Update issue templates

Author: streamtw

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+Please check the following instructions before submitting a bug :
+ * Make sure you are using the latest version.
+ * Make sure you read [installation](http://unisharp.github.io/laravel-filemanager/installation), [integration](http://unisharp.github.io/laravel-filemanager/integration), and [upgrade](http://unisharp.github.io/laravel-filemanager/upgrade) document.
+
+And provide the followings :
+ * Operating system :
+ * Laravel version :
+ * Package version :
+ * Steps to reproduce your issue :
+ * Screenshots of browser console :

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.