v4.0.2

Changed

• Update API DOCs link on the README.md #1914 (nandan-bhat)
• Updating API DOCs #1913 (nandan-bhat)

Fixed

• fix: read and migrate v3 session format to v4 #1923 (guabu)
• fix/updateV4MigrationGuide #1925 (tusharpandey13)