housekeeping: kotlin / fix compiler warnings

src/main/kotlin/swot/Compiler.kt

@@ -11,7 +11,7 @@ object CompilationState {
     val domains = File("lib/domains/tlds.txt").readLines().toHashSet()
 }
 
-fun main(args: Array<String>) {
+fun main() {
     val root = File("lib/domains")
     root.walkTopDown().forEach {
         if (it.isFile) {

src/main/kotlin/swot/Swot.kt

@@ -42,7 +42,7 @@ private fun findSchoolNames(parts: List<String>): List<String> {
 }
 
 private fun domainParts(emailOrDomain: String): List<String> {
-    return emailOrDomain.trim().toLowerCase().substringAfter('@').substringAfter("://").substringBefore(':').split('.').reversed()
+    return emailOrDomain.trim().lowercase().substringAfter('@').substringAfter("://").substringBefore(':').split('.').reversed()
 }
 
 internal fun checkSet(set: Set<String>, parts: List<String>): Boolean {