Bump scalatest dependency (#65)

diff --git a/tests/build.gradle b/tests/build.gradle
index b4cc4d5..c564eb4 100644
--- a/tests/build.gradle
+++ b/tests/build.gradle
@@ -42,7 +42,7 @@
     testCompile 'org.apache.httpcomponents:httpmime:4.3.6'
     testCompile 'junit:junit:4.11'
     testCompile 'com.jayway.restassured:rest-assured:2.4.1'
-    testCompile 'org.scalatest:scalatest_2.11:2.2.4'
+    testCompile 'org.scalatest:scalatest_2.11:3.0.1'
     testCompile 'org.seleniumhq.selenium:selenium-java:2.45.0'
     testCompile 'io.spray:spray-testkit_2.11:1.3.3'
     testCompile 'io.spray:spray-json_2.11:1.3.2'