Update version specifications to fix incompatibility with okhttp 4.0 version. Bump version to 2.2.4

Author: Robert Ramsay

RELEASE.md

@@ -1,3 +1,7 @@
+## [2.2.4](http://central.maven.org/maven2/com/telesign/telesign/2.2.4/) - 2018-10-02
+- 2019-05-28
+  - Update dependency version specifications
+
 ## [2.2.3](http://central.maven.org/maven2/com/telesign/telesign/2.2.3/) - 2018-10-02
 - 2018-10-02
   - Removed log messages.

build.gradle

@@ -17,11 +17,11 @@ repositories {
 }
 
 dependencies {
-    compile 'com.squareup.okhttp3:okhttp:[3.3,)'
-    compile 'com.google.code.gson:gson:[2.7,)'
+    compile 'com.squareup.okhttp3:okhttp:[3.3,4.0)'
+    compile 'com.google.code.gson:gson:[2.7,3.0)'
 
     testCompile group: 'junit', name: 'junit', version: '[4.1,)'
-    testCompile group: 'com.squareup.okhttp3', name: 'mockwebserver', version: '[3.7.0,)'
+    testCompile group: 'com.squareup.okhttp3', name: 'mockwebserver', version: '[3.7.0,4.0)'
 }
 
 jacocoTestReport {