Fixed directory name typo.

samples/kotlin/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    application
+    kotlin("jvm") version "1.2.50"
+}
+
+defaultTasks(ApplicationPlugin.TASK_RUN_NAME)
+
+dependencies {
+    compile("net.thauvin.erik:pinboard-poster:1.0.0")
+}
+
+application {
+    mainClassName = "net.thauvin.erik.pinboard.samples.KotlinExampleKt"
+}
+
+repositories {
+    mavenLocal()
+    jcenter()
+}