Upgrade to latest Tomcat 9.

Signed-off-by: John D. Ament <john.d.ament@gmail.com>

Author: johnament

pom.xml

@@ -58,7 +58,7 @@
         <assertj.version>3.8.0</assertj.version>
         <commons-io.version>2.5</commons-io.version>
         <javax.servlet-api.version>3.1.0</javax.servlet-api.version>
-        <tomcat.version>9.0.0.M21</tomcat.version>
+        <tomcat.version>9.0.0.M22</tomcat.version>
         <jacoco.version>0.7.9</jacoco.version>
         <johnzon.version>1.1.1</johnzon.version>
         <metrics.version>3.2.3</metrics.version>