Support for Lotus v1.12.0-rc
Upgrade to lotus v1.12.0-rc1 and v6 actors (#147) * Upgrade Lotus dependencies * Bump specs-actors version to v6 * Add missing go.sum dependency * Update filecoin-ffi * Update node mock for tests
Upgrade to lotus v1.12.0-rc1 and v6 actors (#147) * Upgrade Lotus dependencies * Bump specs-actors version to v6 * Add missing go.sum dependency * Update filecoin-ffi * Update node mock for tests