Update README.md (#323)

Correction Poetry installation Scripts

## Problem

There was an error in the poetry installation snippet in the Readme

`poetry add pinecone` instead of `poetry add pinecone-client`

## Solution

Replaced `poetry add pinecone`  with  `poetry add pinecone-client`

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [x] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

## Test Plan

Describe specific steps for validating this change.

README.md

@@ -43,10 +43,10 @@ pip3 install "pinecone-client[grpc]"==3.0.0
 
 ```shell
 # Install the latest version
-poetry add pinecone
+poetry add pinecone-client
 
 # Install the latest version, with grpc extras
-poetry add pinecone --extras grpc
+poetry add pinecone-client --extras grpc
 
 # Install a specific version
 poetry add pinecone-client==3.0.0