Update README.md

README.md

@@ -10,7 +10,7 @@ each given instance into any of the found clusters.
 To find more information about this algorithm, have a look at the 
 [Wikipedia page](https://en.wikipedia.org/wiki/K-means_clustering).
 
-This implementation is not meant to be used in a production environments,
+This implementation is not meant to be used in production environments,
 because it uses just the simple Python means; no usage of NumPy or any other
 scientific and compute performance optimized library. The purpose of this 
 project is to be rather descriptive and not for being used in any mission-critical