Fix tense

README.md

@@ -289,7 +289,7 @@ While AlphaFold's and, by extension, OpenFold's source code is licensed under
 the permissive Apache Licence, Version 2.0, DeepMind's pretrained parameters 
 fall under the CC BY 4.0 license, a copy of which is downloaded to 
 `openfold/resources/params` by the installation script. Note that the latter
-replaced the original, more restrictive CC BY-NC 4.0 license as of January 2022.
+replaces the original, more restrictive CC BY-NC 4.0 license as of January 2022.
 
 ## Contributing