github: Format and reword issue template a bit

[ci skip]

Author: chfoo

ISSUE_TEMPLATE.md

@@ -1,23 +1,29 @@
-Please fill this or delete as needed. You can use toolbar and preview feature located above this textbox.
+<!--
+Please review the guidelines for contributing to this repository.
 
-*What I wanted:* Describe what you want to achieve here
+Please fill in as much as you can and delete lines if needed. You can use toolbar and preview feature located above this textbox.
+
+The more info you provide, the easier it is to diagnose and fix. If you have more info later, please add it. Thank you!
+-->
+
+*What I wanted:* (Describe briefly what you want to achieve here)
 
-*What I expect:* Describe how you think the program will work
+*What I expect:* (Describe briefly how you think the program/feature will work)
 
-*What happened:* Describe what actually happened instead
+*What happened:* (Describe briefly what actually happened instead)
 
-*The command or website causes the problem:* Copy the options provided to Wpull here
+*The command or website causes the problem:* (Copy the options provided to Wpull here)
 
-*Operating system:* Write your OS name here such as Windows 10/Ubuntu Linux 14.04 32-bit/OS X 10.10
+*Operating system:* (Write your OS name here such as Windows 10/Ubuntu Linux 14.04 32-bit/OS X 10.10)
 
-*Python version:* What does `python --version` say?
+*Python version:* (What does `python --version` say?)
 
-*Wpull version:* What does `wpull --version` say?
+*Wpull version:* (What does `wpull --version` say?)
 
-*Log/Output:* Put a pastebin link here that does not expire or
+*Log/Output:* (Put a pastebin link here that does not expire or
 
 ```
 Copy a snippet of the log or what Wpull outputs here
 ```
 
-or attach the file. Include any sample files too.
+or attach the file. Include any sample files too.)