Merge branch 'master' into bug/3541-3470-schemes

.github/issue_template.md

-When reporting an issue, please provide the following details:
-- swagger-ui version
-- a swagger file reproducing the issue
+<!---
+Thanks for filing an issue 😄 ! Before you submit, please read the following:
+
+Search open/closed issues before submitting since someone might have asked the same thing before!
+
+Issues on GitHub are only related to problems of Swagger-UI itself. We'll try to offer support
+here for your use case, but we can't offer help with projects that use Swagger-UI indirectly,
+like Springfox or swagger-node.
+
+Likewise, we can't accept features or bugs in the Swagger/OpenAPI specifications themselves,
+or anything that violates the specifications.
+
+-->
+
+<!--- Provide a general summary of the issue in the title above -->
+
+
+| Q                               | A
+| ------------------------------- | -------
+| Bug or feature request?         |  
+| Which Swagger/OpenAPI version?  |
+| Which Swagger-UI version?       |
+| How did you install Swagger-UI? | 
+| Which broswer & version?        |
+| Which operating system?         | 
+
+
+### Demonstration API definition
+<!--- If you're describing a bug, please provide an API definition that reproduces your problem -->
+<!--- If you have link to a demo repo please link that! -->
+
+<!--- If your spec is large, please put it into a Gist (https://gist.github.com) instead of pasting it here. -->
+
+```yaml
+your: "API definition goes here"
+```
+
+### Configuration (browser query string, constructor, config.yaml)
+<!--- If describing a bug, tell us what your configuration looks like -->
+
+```js
+{
+  "your": { "constructorConfig": "here" }
+}
+```
+
+`?yourQueryStringConfig=here`
+
+### Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+### Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+### Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->
+
+### Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->