Prepare release 1.15.0 (#364)

OpenTelemetry Java Bot · opentelemetrybot · web-flow · commit c2707aa940be · 2022-06-17T15:47:40.000-07:00
Co-authored-by: opentelemetrybot &lt;107717825+opentelemetrybot@users.noreply.github.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## Unreleased
+## Version 1.15.0 (2022-06-17)
 
 ### Consistent sampling
 
diff --git a/version.gradle.kts b/version.gradle.kts
@@ -1,5 +1,5 @@
-val stableVersion = "1.15.0-SNAPSHOT"
-val alphaVersion = "1.15.0-alpha-SNAPSHOT"
+val stableVersion = "1.15.0"
+val alphaVersion = "1.15.0-alpha"
 
 allprojects {
   if (findProperty("otel.stable") != "true") {
