Revert "fix: go get example in README.md (#488)" (#497)

This reverts commit d7ac9b7c9dabb25eef076b57cdc1a639bc9beaf6.
diff --git a/README.markdown b/README.markdown
index 054db54..2a637ac 100644
--- a/README.markdown
+++ b/README.markdown
@@ -28,7 +28,7 @@
 
 Install Redigo using the "go get" command:
 
-    go get github.com/gomodule/redigo
+    go get github.com/gomodule/redigo/redis
 
 The Go distribution is Redigo's only dependency.