Update README and the changelog for 0.4.0 (#218)

Author: dkhalanskyjb

CHANGELOG.md

@@ -1,5 +1,13 @@
 # CHANGELOG
 
+## 0.4.0
+
+- Add the `LocalTime` class for representing time-of-day ([#57](https://github.com/Kotlin/kotlinx-datetime/pull/57)). Thank you, @bishiboosh!
+- Provide `LocalTime#toSecondOfDay`, `LocalTime.fromSecondOfDay`, and various other functions for compact representation of `LocalTime` ([#204](https://github.com/Kotlin/kotlinx-datetime/pull/204)). Thank you, @vanniktech!
+- Provide `LocalDate#toEpochDays`, `LocalDate.fromEpochDays` for representing a `LocalDate` as a single number ([#214](https://github.com/Kotlin/kotlinx-datetime/pull/214)).
+- Rename `Clock.todayAt` to `Clock.todayIn` for naming consistency ([#206](https://github.com/Kotlin/kotlinx-datetime/pull/206)).
+- Update the Kotlin dependency to 1.7.0.
+
 ## 0.3.3
 
 - Just updated Kotlin dependency to 1.7.0-Beta and kotlinx.serialization to 1.3.2

README.md

@@ -321,7 +321,7 @@ kotlin {
     sourceSets {
         commonMain {
              dependencies {
-                 implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.3.2")
+                 implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.4.0")
              }
         }
     }
@@ -332,7 +332,7 @@ kotlin {
 
 ```groovy
 dependencies {
-    implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.3.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.4.0")
 }
 ```
 
@@ -372,7 +372,7 @@ Add a dependency to the `<dependencies>` element. Note that you need to use the
 <dependency>
     <groupId>org.jetbrains.kotlinx</groupId>
     <artifactId>kotlinx-datetime-jvm</artifactId>
-    <version>0.3.2</version>
+    <version>0.4.0</version>
 </dependency>
 ```