Prepare release 1.18.0 (#4742)

OpenTelemetry Java Bot · opentelemetrybot · web-flow · commit 7b9f9f372074 · 2022-09-09T14:07:46.000-05:00
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 1.18.0 (2022-09-09)
 
 ### SDK
 
diff --git a/version.gradle.kts b/version.gradle.kts
@@ -1,4 +1,4 @@
-val snapshot = true
+val snapshot = false
 
 allprojects {
   var ver = "1.18.0"
