Update issue templates

.github/ISSUE_TEMPLATE/-u0001f41b-bug-report.md

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+---
+name: "\\U0001F41B Bug report"
+about: Create a report to help us improve milvus-sdk-java
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Steps/Code to reproduce behavior**
+Follow this [guide](http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports) to craft a minimal bug report. This helps us reproduce the issue you're having and resolve the issue more quickly.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment details**
+
+- Hardware/Softward conditions (OS, CPU, GPU, Memory)
+- Method of installation (Docker, or from source)
+- Milvus version (v0.3.1, or v0.4.0)
+- Milvus configuration (Settings you made in `server_config.yaml`)
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/-u0001f680-feature-request.md

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+---
+name: "\\U0001F680 Feature request"
+about: Suggest an idea for milvus-sdk-java
+title: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. E.g. I wish I could use Milvus to do [...]
+**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, code examples, or references to existing implementations about the feature request here.

.github/ISSUE_TEMPLATE/-u0001f914-general-question.md

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+---
+name: "\\U0001F914 General question"
+about: Ask a general question about milvus-sdk-java
+title: "[QUESTION]"
+labels: ''
+assignees: ''
+
+---
+
+**What is your question?**