upgraded outdated dependencies

Author: Mario Souza

build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'checkstyle'
     id 'eclipse'
     id 'java'
-    id 'com.github.kt3k.coveralls' version '2.7.1'
+    id 'com.github.kt3k.coveralls' version '2.8.2'
     id 'net.saliman.cobertura' version '2.5.3'
 }
 
@@ -33,10 +33,10 @@ repositories {
 dependencies {
     compile 'edu.princeton.cs:algs4:1.0.2'
 
-    testCompile 'com.greghaskins:spectrum:1.0.0'
+    testCompile 'com.greghaskins:spectrum:1.2.0'
     testCompile group: 'junit', name: 'junit', version: '4.12'
 
     // cobertura plugin dependency
     // see: https://github.com/stevesaliman/gradle-cobertura-plugin/blob/master/usage.md
-    testRuntime 'org.slf4j:slf4j-api:1.7.24'
+    testRuntime 'org.slf4j:slf4j-api:1.7.25'
 }