Remove version number from README instructions (#220)

Author: Divjot Arora

README.md

@@ -31,7 +31,7 @@ The MongoDB supported driver for Go.
 The recommended way to get started using the MongoDB Go driver is by using `dep` to install the dependency in your project.
 
 ```bash
-dep ensure -add "go.mongodb.org/mongo-driver/mongo@~1.1.0"
+dep ensure -add "go.mongodb.org/mongo-driver/mongo"
 ```
 
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