Update dependencies

Remove travis config as we don't use travis

build.gradle

@@ -14,7 +14,7 @@ buildscript {
         //Firebase (EH)
         classpath 'com.google.gms:google-services:3.0.0'
         //Realm (EH)
-        classpath "io.realm:realm-gradle-plugin:3.5.0"
+        classpath "io.realm:realm-gradle-plugin:4.2.0"
     }
 }