fix: Requester.addFunction()

src/main/kotlin/fr/postgresjson/connexion/Requester.kt

@@ -43,15 +43,10 @@ class Requester(
     }
 
     fun addFunction(functionsDirectory: File): Requester {
-        functionsDirectory.walk().filter {
+        functionsDirectory.walk()
-            it.isDirectory
+            .filter { it.isFile && it.extension == "sql" }
-        }.forEach { directory ->
+            .forEach {
-            directory.walk().filter {
+                addFunction(it.readText())
-                it.isFile
-            }.forEach { file ->
-                val fileContent = file.readText()
-                addFunction(fileContent)
-            }
             }
         return this
     }