Update README.md

Author: enakai00

README.md

@@ -57,8 +57,8 @@ All remaining operations should be done from the root user.
 ```
 # cd /opt
 # git clone https://github.com/tensorflow/models
-# cd models
-# protoc research/object_detection/protos/*.proto --python_out=.
+# cd models/research
+# protoc object_detection/protos/*.proto --python_out=.
 ```
 
 ## Download the pretrained model binaries