Destination directories now get created when needed

app/specs/spec.py

@@ -45,10 +45,13 @@ class Spec:
             destination if type(destination) == Path else Path(destination)
         )
 
-        # Check existence of destination folder
-        if not self.destination.exists() or not self.destination.is_dir():
+        # Create destination if non-existent
+        try:
+            self.destination.mkdir(parents=True, exist_ok=True)
+
+        except FileExistsError:
             raise NotADirectoryError(
-                "{} doesn't exist or isn't a directory.".format(
+                "{} already exists, but isn't a directory.".format(
                     self.destination
                 )
             )