downgrading shadow plugin to 2.0.4

To solve issues while running on travis

Author: ebartkus

build.gradle

@@ -8,7 +8,7 @@ buildscript {
 plugins {
     id 'idea'
     id 'com.palantir.git-version' version '0.5.2'
-    id 'com.github.johnrengelman.shadow' version '5.0.0'
+    id 'com.github.johnrengelman.shadow' version '2.0.4'
     id 'java'
     id "com.github.spotbugs" version "2.0.0" apply false
     id "net.rdrei.android.buildtimetracker" version "0.11.0"