Remove unnecessary dependency

Author: Mikel Pascual

build.gradle

@@ -48,8 +48,7 @@ apply plugin: 'osgi'
 dependencies {
     signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 
-    compile "org.reactivestreams:reactive-streams:1.0.0"
-    compile "io.reactivex.rxjava2:rxjava:2.1.1"
+    compile "io.reactivex.rxjava2:rxjava:2.1.0"
 
     testCompile group: 'junit', name: 'junit', version: '4.12'