typo fixed

Author: banderlog

README.md

@@ -168,7 +168,7 @@ cd create_wheel
 for i in  cv2/*.so; do chrpath -r '$ORIGIN' $i; done
 
 # final .whl will be in /create_wheel/dist/
-# NB: check versions in the `setup.py`
+# NB: check version in the `setup.py`
 ../venv/bin/python3 setup.py bdist_wheel
 ```