Update retrofit from 2.2.0 -> 2.3.0 and okhttp from 3.7.0 -> 3.8.0

Author: majst01

pom.xml

@@ -196,24 +196,24 @@
     <dependency>
       <groupId>com.squareup.retrofit2</groupId>
       <artifactId>retrofit</artifactId>
-      <version>2.2.0</version>
+      <version>2.3.0</version>
     </dependency>
     <dependency>
       <groupId>com.squareup.retrofit2</groupId>
       <artifactId>converter-moshi</artifactId>
-      <version>2.2.0</version>
+      <version>2.3.0</version>
     </dependency>
     <!-- If we use okhttp instead of java urlconnection we achieve server failover
 			of the influxdb server address resolves to all influxdb server ips. -->
     <dependency>
       <groupId>com.squareup.okhttp3</groupId>
       <artifactId>okhttp</artifactId>
-      <version>3.7.0</version>
+      <version>3.8.0</version>
     </dependency>
     <dependency>
       <groupId>com.squareup.okhttp3</groupId>
       <artifactId>logging-interceptor</artifactId>
-      <version>3.7.0</version>
+      <version>3.8.0</version>
     </dependency>
   </dependencies>
 </project>