Use latest okhttp & retrofit versions for java 1.7

Author: jianghaolu

pom.xml

@@ -61,22 +61,22 @@
       <dependency>
         <groupId>com.squareup.retrofit2</groupId>
         <artifactId>retrofit</artifactId>
-        <version>2.7.2</version>
+        <version>2.6.4</version>
       </dependency>
       <dependency>
         <groupId>com.squareup.okhttp3</groupId>
         <artifactId>okhttp</artifactId>
-        <version>3.12.6</version>
+        <version>3.12.12</version>
       </dependency>
       <dependency>
         <groupId>com.squareup.okhttp3</groupId>
         <artifactId>logging-interceptor</artifactId>
-        <version>3.12.2</version>
+        <version>3.12.12</version>
       </dependency>
       <dependency>
         <groupId>com.squareup.okhttp3</groupId>
         <artifactId>okhttp-urlconnection</artifactId>
-        <version>3.12.2</version>
+        <version>3.12.12</version>
       </dependency>
       <dependency>
         <groupId>com.squareup.okhttp3</groupId>
@@ -86,7 +86,7 @@
       <dependency>
         <groupId>com.squareup.retrofit2</groupId>
         <artifactId>converter-jackson</artifactId>
-        <version>2.7.2</version>
+        <version>2.6.4</version>
       </dependency>
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
@@ -116,7 +116,7 @@
       <dependency>
         <groupId>com.squareup.retrofit2</groupId>
         <artifactId>adapter-rxjava</artifactId>
-        <version>2.7.2</version>
+        <version>2.6.4</version>
       </dependency>
       <dependency>
         <groupId>org.slf4j</groupId>