doc: improve issue template (eggjs#9)

.github/ISSUE_TEMPLATE.md

@@ -1,18 +1,17 @@
 <!--
-Thank you for reporting an issue. Please fill in as much of the template below as you're able.
+Thank you for reporting an issue.
 
 1. It's RECOMMENDED to submit PR for typo or tiny bug fix.
-2. If this's a BUG, please provide: course repetition, error log, platform, node/egg/plugin versions and configuration.
+2. If this's a BUG, please provide: course repetition, error log and configuration. Fill in as much of the template below as you're able.
 3. If this's a FEATURE request, please provide: details, pseudo codes if necessary.
 
-感谢您向我们反馈问题。请尽量填写下面的模板。
+感谢您向我们反馈问题。
 
 1. 我们推荐如果是小问题（错别字修改，小的 bug fix）直接提交 PR。
-2. 如果是一个 BUG，请提供：复现步骤，错误日志，node、egg、和相关插件的版本以及相关配置。
+2. 如果是一个 BUG，请提供：复现步骤，错误日志以及相关配置，并尽量填写下面的模板中的条目。
 3. 如果是一个新需求，请提供：详细需求描述，最好是有伪代码实现。
 -->
 
-* **Type**: <!-- BUG or FEATURE -->
 * **Node Version**:
 * **Egg Version**:
 * **Plugin Name**: