Update version to 0.21.0 (#189) * Update version to 0.21.0 * Update MockLogging.swift * Revert "Update MockLogging.swift" This reverts commit 1aec5107f0093791ace7877b6449d993bca86741. * Rename setFeatureFlagExposure --------- Co-authored-by: bitdrift-opening-capture-sdk-prs[bot] <bitdrift-opening-capture-sdk-prs[bot]@users.noreply.github.com> Co-authored-by: Fran Aguilera <[email protected]>