use built in artifact getType() method

src/main/groovy/org/whitesource/gradle/tasks/CollectProjectInfoTask.groovy

@@ -62,14 +62,15 @@ class CollectProjectInfoTask extends DefaultTask {
 
     def getDependencyInfo(ResolvedDependency dependency) {
         def dependencyInfo = new DependencyInfo()
-        def file = dependency.allModuleArtifacts[0].getFile()
+        def artifact = dependency.getModuleArtifacts()[0]
+        def file = artifact.getFile()
         def sha1 = ChecksumUtils.calculateSHA1(file)
         if (!addedSha1s.contains(sha1)) {
             dependencyInfo.setGroupId(dependency.getModuleGroup())
             dependencyInfo.setArtifactId(file.getName())
             dependencyInfo.setVersion(dependency.getModuleVersion())
             dependencyInfo.setSystemPath(file.getAbsolutePath())
-            dependencyInfo.setType(getFileExtension(file.getName()))
+            dependencyInfo.setType(artifact.getType())
             dependencyInfo.setSha1(sha1)
             addedSha1s.add(sha1)
             dependency.getChildren().each {
@@ -81,11 +82,4 @@ class CollectProjectInfoTask extends DefaultTask {
         }
         return dependencyInfo
     }
-
-    private static String getFileExtension(String filename) {
-        if (StringUtils.isNotBlank(filename)) {
-            return filename.substring(filename.lastIndexOf(".") + 1).toLowerCase()
-        }
-        return null
-    }
 }