docs: add changelog (#66)

Signed-off-by: tison <[email protected]>

CHANGELOG.md

@@ -0,0 +1,58 @@
+# CHANGELOG
+
+All notable changes to this project will be documented in this file.
+
+## [0.14.0] 2024-10-28
+
+Breaking changes:
+
+1. refactor: layouts and encoders should be nested to appenders ([#64](https://github.com/fast/logforth/pull/64))
+
+    Previous code:
+
+    ```rust
+    fn main() {
+        Logger::new()
+            .dispatch(
+                Dispatch::new()
+                    .filter(LevelFilter::Trace)
+                    .layout(JsonLayout::default())
+                    .append(append::Stdout),
+            )
+            .apply()
+            .unwrap();
+
+        log::error!("Hello error!");
+        log::warn!("Hello warn!");
+        log::info!("Hello info!");
+        log::debug!("Hello debug!");
+        log::trace!("Hello trace!");
+    }
+    ```
+
+    New code:
+
+    ```rust
+    fn main() {
+        Logger::new()
+            .dispatch(
+                Dispatch::new()
+                    .filter(LevelFilter::Trace)
+                    .append(append::Stdout::default().with_layout(JsonLayout::default())),
+            )
+            .apply()
+            .unwrap();
+
+        log::error!("Hello error!");
+        log::warn!("Hello warn!");
+        log::info!("Hello info!");
+        log::debug!("Hello debug!");
+        log::trace!("Hello trace!");
+    }
+    ```
+
+2. refactor: unify level/target filter to directive filter ([#65](https://github.com/fast/logforth/pull/65))
+
+    Most `From` conversions are kept so that typically you won't notice the change. But if you directly use `LevelFilter` and `TargetFilter`, they are now removed. The functionalities can be covered by `EnvFilter`.
+
+    Also, the feature flag `env-filter` is removed. The `EnvFilter` is always available now.