Updating retrofit dependency (#661)

Author: conniey

pom.xml

@@ -61,7 +61,7 @@
       <dependency>
         <groupId>com.squareup.retrofit2</groupId>
         <artifactId>retrofit</artifactId>
-        <version>2.5.0</version>
+        <version>2.7.2</version>
       </dependency>
       <dependency>
         <groupId>com.squareup.okhttp3</groupId>
@@ -86,7 +86,7 @@
       <dependency>
         <groupId>com.squareup.retrofit2</groupId>
         <artifactId>converter-jackson</artifactId>
-        <version>2.5.0</version>
+        <version>2.7.2</version>
       </dependency>
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
@@ -116,7 +116,7 @@
       <dependency>
         <groupId>com.squareup.retrofit2</groupId>
         <artifactId>adapter-rxjava</artifactId>
-        <version>2.6.2</version>
+        <version>2.7.2</version>
       </dependency>
       <dependency>
         <groupId>org.slf4j</groupId>