Fix incorrect path to main script.

Changed script location to point to the correct location, `scripts/download_and_correct_corpus.py`. Also added instructions for installing required dependencies.

Author: frreiss

README.md

@@ -2,11 +2,12 @@
 Research into identifying and correcting incorrect labels in the CoNLL-2003 corpus.
 
 To download the CoNLL-2003 corpus and apply label corrections to produce a corrected version of
-the corpus, run the command below. The CoNLL-2003 corpus is licensed for research use only. Be
+the corpus, run the commands below. The CoNLL-2003 corpus is licensed for research use only. Be
 sure to adhere to the terms of the license when using this data set!
 
 ```bash
-python scripts/download_corpus_and_correct_labels.py
+pip3 install text-extensions-for-pandas
+python3 scripts/download_and_correct_corpus.py
 ```
 
 This will download the CoNLL-2003 corpus to `original_corpus/`, apply corrections and save the