Replace version tag by lastest in README (#27)

Author: curquiza

README.md

@@ -60,7 +60,7 @@ $ docker run -t --rm \
     -e MEILISEARCH_HOST_URL=<your-meilisearch-host-url> \
     -e MEILISEARCH_API_KEY=<your-meilisearch-api-key> \
     -v <absolute-path-to-your-config-file>:/docs-scraper/config.json \
-    getmeili/docs-scraper:v0.9.0 pipenv run ./docs_scraper config.json
+    getmeili/docs-scraper:latest pipenv run ./docs_scraper config.json
 ```
 
 ### In a GitHub Action
@@ -83,14 +83,16 @@ run-scraper:
           -e MEILISEARCH_HOST_URL=$HOST_URL \
           -e MEILISEARCH_API_KEY=$API_KEY \
           -v $CONFIG_FILE_PATH:/docs-scraper/config.json \
-          getmeili/docs-scraper:v0.9.0 pipenv run ./docs_scraper config.json
+          getmeili/docs-scraper:latest pipenv run ./docs_scraper config.json
 ```
 
+WARNING: We do not recommend using the `latest` image in production. Use the [release tags](https://github.com/meilisearch/docs-scraper/releases) instead.
+
 Here is the [GitHub Action file](https://github.com/meilisearch/documentation/blob/master/.github/workflows/gh-pages-scraping.yml) we use in production for the MeiliSearch documentation.
 
 ### About the API Key
 
-The API key you must provide as environment variable should have the permissions to add documents into your MeiliSearch instance.
+The API key you must provide as an environment variable should have the permissions to add documents into your MeiliSearch instance.
 
 Thus, you need to provide the private key or the master key.