Merge pull request gurland#8 from vtronko/patch-1

Fix incorrect environment variables in readme

README.md

@@ -28,7 +28,7 @@ python cleaner.py
 > You need both App api_id and App api_hash to use script.
 
 #### Environment variables
-You could set APP_ID and APP_HASH environment variables to prevent entering API credentials manually.
+You could set API_ID and API_HASH environment variables to prevent entering API credentials manually.
 
 #### Start
 After starting script you will be prompted:
@@ -69,4 +69,4 @@ Searching messages. OFFSET: 0
 Found 4 your messages in selected supergroup
 Deleting 4 messages with next message IDs:
 [23807, 23799, 23757, 23756]
-```
+```