Downgrade okhttp to 3.12.2 (#47)

Author: Daniel Rees

build.gradle

@@ -20,7 +20,7 @@ repositories {
 dependencies {
   compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
   compile "com.google.code.gson:gson:2.8.5"
-  compile "com.squareup.okhttp3:okhttp:3.14.1"
+  compile "com.squareup.okhttp3:okhttp:3.12.2"
 
 
   testCompile group: 'junit', name: 'junit', version: '4.12'