fix pip install / client name

Author: hootnot

API.md

@@ -11,13 +11,13 @@ JSON.
 ## Installation
 
 ```bash
-$ pip install rejson-py
+$ pip install rejson
 ```
 
 ## Usage example
 
 ```python
-from rejson import ReJSONClient, Path
+from rejson import Client, Path
 
 rj = Client(host='localhost', port=6379)
 

rejson/__init__.py

@@ -9,13 +9,13 @@
 ## Installation
 
 ```bash
-$ pip install rejson-py
+$ pip install rejson
 ```
 
 ## Usage example
 
 ```python
-from rejson import ReJSONClient, Path
+from rejson import Client, Path
 
 rj = Client(host='localhost', port=6379)
 
@@ -114,4 +114,4 @@ def decode(self, obj):
 """
 
 from .client import Client
-from .path import Path
+from .path import Path