v2.0.7: Do not santitize empty strings (#43)

#### Please describe this change
<!--
In particular, your use case, any related issues, any questions you may
have, functionality you are unsure is correct, etc.
-->


#### Changes
What types of changes does your code introduce?
<!--
Put an `[x]` in all the boxes that apply.
-->
* [x] Bugfix
* [ ] Tech Debt (fixes an infrastructure issue, code quality issue,
etc.)
* [ ] Feature development
* [ ] Other (please explain here)


#### Checklist
<!--
Put an `[x]` in all the boxes that apply.
-->
* [x] Unit tests, acceptance tests, lint checks, code style checks,
etc., all pass

Sanitize JSON-encoded strings (#42)

* Sanitize JSON-encoded strings

Sanitize JSON-encoded secrets (#41)

* Sanitize JSON-encoded secrets

* Update entry.go

Delete Gopkg.toml

v2.0.2: error formatting bugfix (#27)

v2.0.1: upgrade errors package (#26)

v2.0.0 release (#25)

Add gRPC request interceptor (#24)

* Add gRPC request interceptor

* cleanup

* update CHANGELOG.md

* update tests

Publish LevelString like ParseLevel (#23)