Fix default behavior of join

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = fsub
-version = 1.0.0
+version = 1.0.1
 author = Augusto Lenz Gunsch
 author_email = augustogunsch@tutanota.com
 description = CLI SubRip editor

src/fsub/fsub.py

@@ -498,7 +498,8 @@ def run(args):
             try:
                 file = parsed_files.pop(0)
                 first += file
-                file.delete()
+                if args.replace:
+                    file.delete()
             except IndexError:
                 break
         parsed_files.append(first)