Update README.md

Signed-off-by: mishaschwartz <[email protected]>

Author: mishaschwartz

README.md

@@ -5,7 +5,7 @@ A python library to access information about the Marble climate infomatics netwo
 
 To install `marble_client` issue this command:
 ```shell
-pip install marble_client
+pip install marble-client
 ``` 
 
 ## Basic usage
@@ -150,4 +150,4 @@ access the resource if you have permission:
 
 ```python
 >>> session.get(f"{client.this_node.url}/some/protected/subpath")
-```
+```