update README import Mixnode statements

Author: devsteelcoder

README.md

@@ -31,7 +31,7 @@ This SDK comes with Basic Authentication over HTTPS which requires you to pass y
 This type of token is given directly to the application.
 
 ``` Python
-import Mixnode
+from mixnode import Mixnode
 
 # Create an instance of the Mixnode Client
 client = Mixnode("Your API Key") #add your API KEY here; available at https://www.mixnode.com/account/api

README.rst

@@ -50,7 +50,7 @@ This type of token is given directly to the application.
 
 .. code:: Python
 
-    import Mixnode
+    from mixnode import Mixnode
 
     # Create an instance of the Mixnode Client
     client = Mixnode("Your API Key") #add your API KEY here; available at https://www.mixnode.com/account/api

mixnode/__init__.py

@@ -22,7 +22,7 @@
 mixnode - Mixnode Python SDK
 ~~~~~~~~~~~~~~~~~~~~~
 
-   >>> import mixnode
+   >>> from mixnode import Mixnode
    >>> client = Mixnode('Your API Key')
 
 :license: Apache 2.0, see LICENSE for more details.