Increase git depth to satisfy version inference

Author: akarnokd

.travis.yml

@@ -5,7 +5,7 @@ sudo: false
 # as per http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
 
 git:
-  depth: 20
+  depth: 50
 
 # prevent travis running gradle assemble; let the build script do it anyway
 install: true

src/test/java/rx/internal/operators/OnSubscribeCollectTest.java

@@ -24,7 +24,6 @@
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicBoolean;
 
-import org.junit.Assert;
 import org.junit.Test;
 
 import rx.Observable;