chore: release 0.4.0 (#178)

Author: ex0ns

README.md

@@ -12,9 +12,9 @@ Add the following dependency to your project's build file
 
 ```scala
 // sbt
-"com.bot4s" %% "zmatrix" % "0.3.4"
+"com.bot4s" %% "zmatrix" % "0.4.0"
 // mill
-ivy"com.bot4s::zmatrix:0.3.4"
+ivy"com.bot4s::zmatrix:0.4.0"
 ```
 
 It is also possible to get the latest snapshot from [Snapshot Artifacts][link-sonatypesnapshots] by adding the following

build.sc

@@ -19,7 +19,7 @@ val scalaVersions = List("2.12.19", "2.13.13", "3.3.3")
 
 trait Publishable extends PublishModule {
   override def artifactName   = "zmatrix"
-  override def publishVersion = "0.3.4"
+  override def publishVersion = "0.4.0"
 
   override def pomSettings = PomSettings(
     description = "Matrix.org API client written using ZIO",