[Doc] Update built-in tools in README.md (#981)

This PR updates built-in tools in README.md

`Langchain::Tool::Wikipedia` requires the `wikipedia-client` gem.
This also adds the missing `Langchain::Tool::GoogleSearch` and `Langchain::Tool::Vectorsearch` to the list.
`Langchain::Tool::RubyCodeInterpreter` has been moved to follow ASCII-based sort order.

Author: koic

README.md

@@ -551,11 +551,13 @@ assistant.tool_execution_callback = -> (tool_call_id, tool_name, method_name, to
 * `Langchain::Tool::Calculator`: Useful for evaluating math expressions. Requires `gem "eqn"`.
 * `Langchain::Tool::Database`: Connect your SQL database. Requires `gem "sequel"`.
 * `Langchain::Tool::FileSystem`: Interact with the file system (read & write).
-* `Langchain::Tool::RubyCodeInterpreter`: Useful for evaluating generated Ruby code. Requires `gem "safe_ruby"` (In need of a better solution).
+* `Langchain::Tool::GoogleSearch`: Wrapper around SerpApi's Google Search API. Requires `gem "google_search_results"`.
 * `Langchain::Tool::NewsRetriever`: A wrapper around [NewsApi.org](https://newsapi.org) to fetch news articles.
+* `Langchain::Tool::RubyCodeInterpreter`: Useful for evaluating generated Ruby code. Requires `gem "safe_ruby"` (In need of a better solution).
 * `Langchain::Tool::Tavily`: A wrapper around [Tavily AI](https://tavily.com).
+* `Langchain::Tool::Vectorsearch`: A wrapper for vector search classes.
 * `Langchain::Tool::Weather`: Calls [Open Weather API](https://home.openweathermap.org) to retrieve the current weather.
-* `Langchain::Tool::Wikipedia`: Calls Wikipedia API.
+* `Langchain::Tool::Wikipedia`: Calls Wikipedia API. Requires `gem "wikipedia-client"`.
 
 ### Creating custom Tools
 The Langchain::Assistant can be easily extended with custom tools by creating classes that `extend Langchain::ToolDefinition` module and implement required methods.