sea-orm-rocket 0.6.0

# SeaORM Rocket support crate.

Not all versions of `sea-orm-rocket` are compatible with every version of Rocket
due to breaking changes in the Rocket database management API. Please reference
the below table to determine which version of `sea-orm-rocket` is appropriate
for your use case.

| Rocket version | `sea-orm-rocket` version |
| :------------- | -----------------------: |
| v0.5.0 (+ RCs) |                   v0.5.5 |
| v0.5.1         |                   v0.6.0 |