Doesn't allow nested revisions directory

[kevlarr]

Given a structure like...

database/
└── revisions/
    └── ...files
jrny.toml
jrny-env.toml

... and a jrny.toml file like...

[revisions]
directory = "database/revisions"

[table]
schema = "jrny"
name = "revisions"

... trying to use any jrny command from the same directory as the config & env files results in an error like...

Error: `jrny-env.toml` must exist within same directory as config file or `--database-url` must be provided