Prepare for 4.3.0 release.

CHANGELOG.md

-# Changes in version 4.?.? - 2019-1?-??
+# Changes in version 4.3.0 - 2020-01-15
 
  * Medium changes
    - Turn absolute links to nearby addresses and translations into
      relative links to avoid falling back to http://. Use the base URL
      from the deployment descriptor for the printed permanent link,
      also to avoid falling back to http://.
+   - Update to metrics-lib 2.10.0.
 
 
 # Changes in version 4.2.0 - 2019-11-09

build.xml

@@ -9,8 +9,8 @@
 
   <property name="javadoc-title" value="ExoneraTor API Documentation"/>
   <property name="implementation-title" value="ExoneraTor" />
-  <property name="release.version" value="4.2.0-dev" />
-  <property name="metricslibversion" value="2.9.1" />
+  <property name="release.version" value="4.3.0" />
+  <property name="metricslibversion" value="2.10.0" />
   <property name="jetty.version" value="-9.2.21.v20170120" />
   <property name="warfile"
             value="exonerator-${release.version}.war"/>