Update dependencies (#841)

Author: gjmwoods

pom.xml

@@ -70,7 +70,7 @@
       <dependency>
         <groupId>io.projectreactor</groupId>
         <artifactId>reactor-bom</artifactId>
-        <version>Dysprosium-SR16</version>
+        <version>Dysprosium-SR17</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -79,7 +79,7 @@
       <dependency>
         <groupId>io.reactivex.rxjava2</groupId>
         <artifactId>rxjava</artifactId>
-        <version>2.2.20</version>
+        <version>2.2.21</version>
       </dependency>
 
       <!-- Optional dependencies -->