Merge pull request #137 from line/issue_template

Add issue template

Author: kimoto

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,33 @@
+---
+title: 'Bug Report'
+labels: bug
+---
+
+ <!--
+## Do this before creating an issue
+ - Check our [developer documentation](https://developers.line.biz/en/docs/) and [FAQ](https://developers.line.biz/en/faq/messaging-api/) page for more information on LINE bots and the Messaging API
+ ## When creating an issue
+ - Provide detailed information about the issue you had with the SDK as below
+-->
+
+ ## System Informations
+
+ * Ruby version:
+ * Gem (line-bot-api) version:
+ * OS:
+
+ ## Expected Behavior
+<!-- Tell us what should happen -->
+
+ ## Current Behavior
+<!-- Tell us what happens instead of the expected behavior -->
+
+ ## Steps to Reproduce
+<!-- Provide a link to a live example, or an unambigeous set of steps to -->
+1.
+1.
+1.
+1.
+
+ ## Logs
+<!-- Provide logs if possible -->