Update bug_reprot.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,5 +1,5 @@
 ---
-name: Bug report
+name: Bug Report
 about: Create a report to help us improve
 title: ''
 labels: ''
@@ -7,32 +7,37 @@ assignees: ''
 
 ---
 
-**Describe the bug**
-A clear and concise description of what the bug is.
+> ℹ Please fill out this template when filing an issue.
+> All lines beginning with an ℹ symbol instruct you with what info we expect. You can delete those lines once you've filled in the info.
+>
+> Per our [*CONTRIBUTING guidelines](https://github.com/Alamofire/Alamofire/blob/master/CONTRIBUTING.md), we use GitHub for
+> bugs and feature requests, not general support. Other issues should be opened on Stack Overflow with the tag `alamofire`.
+>
+> Please remove this line and everything above it before submitting.
 
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
+* [ ] I've read, understood, and done my best to follow the [*CONTRIBUTING guidelines](https://github.com/Alamofire/Alamofire/blob/master/CONTRIBUTING.md).
 
-**Expected behavior**
-A clear and concise description of what you expected to happen.
+## What did you do?
 
-**Screenshots**
-If applicable, add screenshots to help explain your problem.
+ℹ Please replace this with what you did.  
 
-**Desktop (please complete the following information):**
- - OS: [e.g. iOS]
- - Browser [e.g. chrome, safari]
- - Version [e.g. 22]
+## What did you expect to happen?
 
-**Smartphone (please complete the following information):**
- - Device: [e.g. iPhone6]
- - OS: [e.g. iOS8.1]
- - Browser [e.g. stock browser, safari]
- - Version [e.g. 22]
+ℹ Please replace this with what you expected to happen.  
 
-**Additional context**
-Add any other context about the problem here.
+## What happened instead?
+
+ℹ Please replace this with of what happened instead.  
+
+## Alamofire Environment
+
+**Alamofire Version:**
+**Dependency Manager:**
+**Xcode Version:**
+**Swift Version:**
+**Platform(s) Running Alamofire:**
+**macOS Version Running Xcode:**
+
+## Demo Project
+
+ℹ Please link to or upload a project we can download that reproduces the issue.