Update readme install examples

Author: benjaminran

README.md

@@ -5,6 +5,19 @@ For more information, see the docs at https://www.pinecone.io/docs/
 
 ## Installation
 
+Install a released version from pip:
+```shell
+pip install pinecone-client
+```
+
+Or the latest development version:
+```shell
+pip install git+https://[email protected]/pinecone-io/pinecone-python-client.git
+```
+
+Or a specific development version:
 ```shell
 pip install git+https://[email protected]/pinecone-io/pinecone-python-client.git
+pip install git+https://[email protected]/pinecone-io/pinecone-python-client.git@example-branch-name
+pip install git+https://[email protected]/pinecone-io/pinecone-python-client.git@259deff
 ```