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Issue Description:

I've noticed that the only way I can get swift-format to use a custom config is to set the '--configuration' flag explicitly.

My understanding from the docs is that if a file named '.swiftformat' exists within the same directory as the file – or any of its parent directories – swift-format should use that configuration instead.

Example: working In a dir named TestFormat are two files: Test.swift and '.swiftformat'. The '.swiftformat' file has its indentation set to four spaces.

Expected:
When you call `swift-format -r -i .`, Test.swift is formatted with indentation of four spaces.

Actual:
When you call `swift-format -r -i .`, Test.swift is formatted with the default configs indentation of two spaces.

Workaround:
Call `swift-format -r -i --configuration .swiftformat .` specifying the config explicitly instead.