Update README.md

Author: andrewshvv

README.md

@@ -1,3 +1,3 @@
-Macaroon auth library stores requires preventives to use macaroon as the 
+Macaroon auth library implements requires primitives to use macaroon as the 
 application authorization token. To see the example of usage from client side
- go the the [example](/example/client.go) directory.
+ go the the [example](/example/client.go) directory.