Changelog updates to reflect work that went out in 4.18.0

Patch by Bret McGuire; reviewed by Bret McGuire, Alexandre Dutra for PR 1914

Author: absurdfarce

changelog/README.md

@@ -21,6 +21,16 @@ under the License.
 
 <!-- Note: contrary to 3.x, insert new entries *first* in their section -->
 
+### 4.18.0
+
+- [improvement] PR 1689: Add support for publishing percentile time series for the histogram metrics (nparaddi-walmart)
+- [improvement] JAVA-3104: Do not eagerly pre-allocate array when deserializing CqlVector
+- [improvement] JAVA-3111: upgrade jackson-databind to 2.13.4.2 to address gradle dependency issue
+- [improvement] PR 1617: Improve ByteBufPrimitiveCodec readBytes (chibenwa)
+- [improvement] JAVA-3095: Fix CREATE keyword in vector search example in upgrade guide
+- [improvement] JAVA-3100: Update jackson-databind to 2.13.4.1 and jackson-jaxrs-json-provider to 2.13.4 to address recent CVEs
+- [improvement] JAVA-3089: Forbid wildcard imports
+
 ### 4.17.0
 
 - [improvement] JAVA-3070: Make CqlVector and CqlDuration serializable