Update README.md

Author: cuilimeng

README.md

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 ## Introduction
 
-CoAID (<ins>Co</ins>vid-19 he<ins>A</ins>lthcare m<ins>I</ins>sinformation <ins>D</ins>ataset) is a diverse COVID-19 healthcare misinformation dataset, including fake news on websites and social platforms, along with users' social engagement about such news. It includes 4,251 news, 296,000 related user engagements, 926 social platform posts about COVID-19, and ground truth labels.
+CoAID (<ins>Co</ins>vid-19 he<ins>A</ins>lthcare m<ins>I</ins>sinformation <ins>D</ins>ataset) is a diverse COVID-19 healthcare misinformation dataset, including fake news on websites and social platforms, along with users' social engagement about such news. It includes 5,216 news, 296,752 related user engagements, 958 social platform posts about COVID-19, and ground truth labels.
 
 If you use this dataset, we appreciate it if you cite the following paper:
 
@@ -30,3 +30,7 @@ Version 0.2 (08/03/2020)
 Version 0.3 (11/03/2020)
 
 - added data from July 1, 2020 through September 1, 2020
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+Version 0.4 (01/08/2021)
+
+- added data from September 1, 2020 through November 1, 2020