fix: update readme

Author: Irene Alvarado

README.md

@@ -101,8 +101,29 @@ For example, if this field is set to `Bearer abc123` then the following header i
 }
 ```
 
-And in the action yaml:
-`authorization: 'Bearer abc123'`
+#### `axios_config` (optional)
+
+Under the hood, the `http` backend uses [Axios](https://github.com/axios/axios) for data fetching. By default, Flat assumes you're interested in using the `GET` method to fetch data, but if you'd like to `POST` (e.g., sending a GraphQL query), the `axios_config` option allows you to override this behavior.
+
+Specifically, the `axios_config` parameter should reflect a relative path to a `.json` file in your repository. This JSON file should mirror the shape of [Axios' request config parameters](https://github.com/axios/axios#request-config), with a few notable exceptions.
+
+- `url` and `baseURL` will both be ignored, as the `http_url` specified above will take precedence.
+- `headers` will be merged in with the authorization header described by the `authorization` parameter above. Please do not put secret keys here, as they will be stored in plain text!
+- All `function` parameters will be ignored (e.g., `transformRequest`).
+- The response type is always set to `responseType: 'stream'` in the background.
+
+An example `axios_config` might look thusly if you were interested in hitting GitHub's GraphQL API ([here is a demo](https://github.com/githubocto/flat-demo-graphql)) 👇
+
+```json
+{
+  "method": "post",
+  "data": {
+    "query": "query { repository(owner:\"octocat\", name:\"Hello-World\") { issues(last:20, states:CLOSED) { edges { node { title url labels(first:5) { edges { node { name } } } } } } } }"
+  }
+}
+```
+
+We advise escaping double quotes like `\"` in your JSON file.
 
 #### `downloaded_filename`
 

dist/LICENSE

@@ -15,6 +15,15 @@ MIT
 
 @actions/io
 MIT
+The MIT License (MIT)
+
+Copyright 2019 GitHub
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 @azure/ms-rest-azure-env
 MIT
@@ -3091,7 +3100,7 @@ pg
 MIT
 MIT License
 
-Copyright (c) 2010 - 2020 Brian Carlson
+Copyright (c) 2010 - 2021 Brian Carlson
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -3182,7 +3191,7 @@ pg-protocol
 MIT
 MIT License
 
-Copyright (c) 2010 - 2020 Brian Carlson
+Copyright (c) 2010 - 2021 Brian Carlson
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -4199,8 +4208,7 @@ MIT
 
 underscore
 MIT
-Copyright (c) 2009-2020 Jeremy Ashkenas, DocumentCloud and Investigative
-Reporters & Editors
+Copyright (c) 2009-2021 Jeremy Ashkenas, Julian Gonggrijp, and DocumentCloud and Investigative Reporters & Editors
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation