docs: update README

README.md

@@ -4,6 +4,21 @@ bKash API client for Browser & Node.js
 
 bKash API docs: https://developer.bka.sh/v1.0.0-beta/reference
 
+---
+
+## NOTICE
+
+**bKash used to publish OpenAPI Specification for their API on the [bKash-developer/openapi](https://github.com/bKash-developer/openapi) repository.**
+
+**Which they decided to remove, for reasons I can't imagine.**
+
+**As this library was created based on that specification, it is now outdated.**
+
+**If anybody from bKash (who's related to the decision to unpublish the specification) sees this,** 
+**if you care about developer experience I urge you to reconsider that decision.**
+
+---
+
 ## Installation
 
 via **npm**:
@@ -42,14 +57,17 @@ const clientOptions = {
 const bkash = new BKash(clientOptions)
 
 // https://developer.bka.sh/v1.0.0-beta/reference#querypaymentusingget
-bkash.queryPayment({
- paymentID: '42'
-}).then(({ data, error, headers, meta }) => {
- // data -> HTTP Status Code < 400
- // error -> HTTP Status Code >= 400
-}).catch(err => {
- // HTTP Status Code >= 500
-})
+bkash
+ .queryPayment({
+ paymentID: '42'
+ })
+ .then(({ data, error, headers, meta }) => {
+ // data -> HTTP Status Code < 400
+ // error -> HTTP Status Code >= 400
+ })
+ .catch(err => {
+ // HTTP Status Code >= 500
+ })
 ```
 
 ## Authentication
@@ -59,14 +77,14 @@ bkash.queryPayment({
 bkash.authenticate({
  type: 'simple',
  username: '...', // headers[`username`]
- password: '...'  // headers[`password`]
+ password: '...' // headers[`password`]
 })
 
 // required for all other methods
 bkash.authenticate({
  type: 'token',
- token: '...',  // headers[`authorization`]
- appkey: '...'  // headers[`x-app-key`]
+ token: '...', // headers[`authorization`]
+ appkey: '...' // headers[`x-app-key`]
 })
 ```