update README

Author: Linusp

README.md

@@ -21,26 +21,10 @@ pip install git+https://github.com/Linusp/python-inoreader.git
 
 ## Usage
 
-1. [Register your application](https://www.inoreader.com/developers/register-app)
-
-2. Set `appid` and `appkey` in your system, you can set them with environment variables like
-
-   ```shell
-   export INOREADER_APP_ID = 'your-app-id'
-   export INOREADER_APP_KEY = 'your-app-key'
-   ```
-
-   or write them in `$HOME/.inoreader`, e.g.:
-   ```shell
-   [auth]
-   appid = your-app-id
-   appkey = your-app-key
-   ```
-
-3. Login to your Inoreader account
+1. Login to your Inoreader account
 
    ```shell
    inoreader login
    ```
 
-3. Use the command line tool `inoreader` to do something, run `inoreader --help` for details
+2. Use the command line tool `inoreader` to do something, run `inoreader --help` for details