Add more guidance to issue template

Author: johanbrandhorst

ISSUE_TEMPLATE.md

@@ -1,41 +1,66 @@
+# The gRPC-Gateway project is maintained by volunteers in their spare time. Please follow these troubleshooting steps before submitting an issue.
 
-# Please follow the general troubleshooting steps first:
-
-- [ ] Update your protoc to the [latest version](https://github.com/google/protobuf/releases) 
-- [ ] Update your copy of `grpc-gateway` to the latest version from github. with 
-  `git fetch https://github.com/grpc-ecosystem/grpc-gateway master && git reset --hard FETCH_HEAD`
+- [ ] Check if your issue has already been reported (https://github.com/grpc-ecosystem/grpc-gateway/issues).
+- [ ] Update your protoc to the [latest version](https://github.com/google/protobuf/releases).
+- [ ] Update your copy of the `grpc-gateway` library to the latest version from github:
+  ```sh
+  go get -u github.com/grpc-ecosystem/grpc-gateway
+  ```
 - [ ] Delete the `protoc-gen-grpc-gateway` and `protoc-gen-swagger` binary from your `PATH`,
-  and install locally built binaries.
+  and reinstall the latest versions:
+  ```sh
+  go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
+  go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
+  ```
+  
+## I still have a problem!
+ 
+Please consider reaching out for help on a chat forum, such as
+[Gophers Slack](https://invite.slack.golangbridge.org/) (channel #grpc-gateway).
+It's much easier to help with common debugging steps in a chat, and some of
+the maintainers are reading the channel regularly. If you
+submit an issue which is clearly an environment setup problem, or it's obvious
+you haven't tried seeking help somewhere else first, we may close your issue.
+ 
+## I still have a problem!
+
+Please follow these steps to submit a bug report:
 
 ### Bug reports:
 
 Fill in the following sections with explanations of what's gone wrong.
 
-Steps you follow to reproduce the error:
+### Steps you follow to reproduce the error:
 
+```html
 <!-- Example steps
 1.  I grab my catapult
 2.  I load it with lettuce
 3.  Press the fire button
 4.  It falls over
 -->
+```
 
 Your steps here.
 
-What did you expect to happen instead:
+### What did you expect to happen instead:
 
+```html
 <!-- Example answer
 1.  It would have rained lettuce from the sky bringing forth a cuddly army of bunnies we could
     play with
 -->
+```
 
 Your answer here.
 
-What's your theory on why it isn't working:
+### What's your theory on why it isn't working:
 
+```html
 <!-- Example answer
 Evil wizards are hoarding the bunnies and don't want to share. The wizards are casting 
 lettuce protection spells so the cattapult won't work.
 -->
+```
 
 Your theory here.