Update README.md

Co-authored-by: Donald Campbell <[email protected]>

README.md

@@ -24,7 +24,7 @@ with PEPhub, but it can be used for any other purpose.
 
 pepdbagent creates a connection to the database and creates table schemas for the PEPhub database if necessary.
 Core database is `postgres` database, but it can be easily extended to other relational databases.
-To use `pepdbagent`, you need to have a database instance running with it's credentials.
+To use `pepdbagent`, you need to have a database instance running with its credentials.
 If the version of the database schema is not compatible with the version of `pepdbagent`, it will throw an exception.
 
 ## Installation