Fixed namespace `Items` class in order to match it with the directory
Fixed namespace `Items` class in order to match it with the directory

| Q             | A
| ------------- | ---
| Branch		| master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Fixed namespace `Items` class in order to match it with the directory

opsway/zohobooks-api