How to increase verbosity?

I've implemented the module as shown in the examples (using 'self' as well as within the organization from a master account). All resources have been created successfully, but when I invoke the Lambda function either manually or via Cron scheduler, no report is created.

An error message is shown in the Cloudwatch logs, but nothing I can really work with. Is there a way to increase the verbosity and/ or enable DEBUG information?

```
START RequestId: 8771c388-99c9-4df8-bfd0-c6c456ef25be Version: $LATEST
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryAccounts
2020/02/14 09:25:35 github.com/GSA/grace-inventory/handler/inv.(*Inv).queryAccounts took 176.360813ms
2020/02/14 09:25:35 Sheet "Accounts" has completed
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryLoadBalancers
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).querySecurityGroups
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryDBSnapshots
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).querySubscriptions
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryParameters
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryInstances
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryKeyPairs
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryConfigRules
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).querySnapshots
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).querySubnets
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryVpcs
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryAddresses
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryKeys
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryImages
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryRoles
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).querySecrets
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryTopics
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryUsers
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryVaults
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryDBInstances
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryBuckets
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryGroups
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryPolicies
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryVolumes
2020/02/14 09:25:35 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryAlarms
2020/02/14 09:25:36 calling github.com/GSA/grace-inventory/handler/inv.(*Inv).queryStacks
2020/02/14 09:25:36 github.com/GSA/grace-inventory/handler/inv.(*Inv).queryRoles took 981.014396ms
2020/02/14 09:25:36 Sheet "Roles" has completed
2020/02/14 09:25:36 github.com/GSA/grace-inventory/handler/inv.(*Inv).queryLoadBalancers took 1.143413201s
unknown type: errorString
null
2020/02/14 09:25:37 Unknown sheet type: *elbv2.LoadBalancer
END RequestId: 8771c388-99c9-4df8-bfd0-c6c456ef25be
REPORT RequestId: 8771c388-99c9-4df8-bfd0-c6c456ef25be Duration: 2535.63 ms Billed Duration: 2600 ms Memory Size: 128 MB Max Memory Used: 74 MB Init Duration: 167.55 ms
```