Update README.md

Added a very clear warning that it is not usable as a ChatGPT detector as it might give incorrect results as well.

README.md

@@ -41,7 +41,7 @@ datasets:
 
 #### Direct Use
 
-The model is a classifier that can be used to detect text generated by GPT-2 models. 
+The model is a classifier that can be used to detect text generated by GPT-2 models. However, it is strongly suggested not to use it as a ChatGPT detector for the purposes of making grave allegations of academic misconduct against undergraduates and others, as this model might it give inaccurate results in the case of ChatGPT generated input.
 
 #### Downstream Use