# v1.2.0

## Highlights

- Added message replacement with `Logger.AddReplacer(old, new)` for masking secrets or normalizing log output.
- Preserved the existing `LoggerWriter.Print(...any)` contract, so custom writers do not need a signature update.
- Improved JSON writer newline handling for messages that already end with `\n`.

## Added

- `Logger.AddReplacer(old, new)` appends a replacement rule that is applied before records are sent to writers.
- README and package GoDoc now document message replacement and include usage examples.
- Tests covering message type preservation for custom writers, JSON empty messages, and JSON trailing newline behavior.

## Fixed

- `LoggerJsonWriter.Print` no longer panics when called with no message arguments.
- `LoggerJsonWriter.Print` now treats a trailing newline at the end of the last message as newline semantics and does not include that newline in the JSON `message` field.
- Log messages keep their original argument types for custom writers when no replacement rules are configured.

## Changed

- Updated the example program to demonstrate `AddReplacer`.
- Updated dependencies:
  - `github.com/fatih/color` from `v1.18.0` to `v1.19.0`
  - `github.com/mattn/go-isatty` from `v0.0.20` to `v0.0.21`
  - `golang.org/x/sys` from `v0.42.0` to `v0.43.0`

## Compatibility

No breaking API changes are intended in this release. The public `LoggerWriter` interface continues to accept `messages ...any`.