Fix documentation for README.md about certificates generator

[vcerenu]

The README.md file used to create the image used in the certificate generation process has the wrong version tag that is currently used in version 4.8

indexer-certs-creator/README.md file:

wazuh-docker/indexer-certs-creator/README.md

Lines 1 to 9 in f3474a3

	# Certificate creation image build
	The dockerfile hosted in this directory is used to build the image used to boot Wazuh's single node and multi node stacks.
	To create the image, the following command must be executed:
	```
	$ docker build -t wazuh/wazuh-certs-generator:0.0.1 .
	```

Certificate Generation Script:

wazuh-docker/single-node/generate-indexer-certs.yml

Lines 1 to 10 in f3474a3

	# Wazuh App Copyright (C) 2017, Wazuh Inc. (License GPLv2)
	version: '3'
	services:
	generator:
	image: wazuh/wazuh-certs-generator:0.0.2
	hostname: wazuh-certs-generator
	volumes:
	- ./config/wazuh_indexer_ssl_certs/:/certificates/
	- ./config/certs.yml:/config/certs.yml

The README.md file version must be corrected to correctly build the image