feat: Add support for gradle's kotlin-dsl

As of gradle v5, kotlin-dsl is now official. It still uses the
same old methods as gradle but the detection of those project with
snyk was broken. This patch adds the support for gradle kotlin-dsl

Kotlin-dsl: https://github.com/gradle/kotlin-dsl/
News here: https://github.com/gradle/gradle/releases/tag/v5.0.0-RC2#kotlin-dsl-1.0

src/lib/detect.ts

@@ -14,6 +14,7 @@ const DETECTABLE_FILES = [
   'Gemfile.lock',
   'pom.xml',
   'build.gradle',
+  'build.gradle.kts',
   'build.sbt',
   'Pipfile',
   'requirements.txt',
@@ -34,6 +35,7 @@ const DETECTABLE_PACKAGE_MANAGERS = {
   'package-lock.json': 'npm',
   'pom.xml': 'maven',
   'build.gradle': 'gradle',
+  'build.gradle.kts': 'gradle',
   'build.sbt': 'sbt',
   'yarn.lock': 'yarn',
   'package.json': 'npm',