Removes the dependency from future-annotations, since the ebuild does
not support <dev-lang/python-3.7, using the __future__ module instead.
Patch by Nicola Smaniotto.

diff --git a/ffsubsync/__init__.py b/ffsubsync/__init__.py
index 1ce6e51..965cb46 100644
--- a/ffsubsync/__init__.py
+++ b/ffsubsync/__init__.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*- 
+from __future__ import annotations 
 import logging
 import sys
 
diff --git a/ffsubsync/aligners.py b/ffsubsync/aligners.py
index 6c7afc7..d777eff 100644
--- a/ffsubsync/aligners.py
+++ b/ffsubsync/aligners.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*- 
+from __future__ import annotations 
 import logging
 import math
 from typing import TYPE_CHECKING
diff --git a/ffsubsync/constants.py b/ffsubsync/constants.py
index 99d08e9..176e786 100644
--- a/ffsubsync/constants.py
+++ b/ffsubsync/constants.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
diff --git a/ffsubsync/ffmpeg_utils.py b/ffsubsync/ffmpeg_utils.py
index ee96da3..10dd923 100644
--- a/ffsubsync/ffmpeg_utils.py
+++ b/ffsubsync/ffmpeg_utils.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 import logging
 import os
 import platform
diff --git a/ffsubsync/ffsubsync.py b/ffsubsync/ffsubsync.py
index d10e969..6005b5c 100755
--- a/ffsubsync/ffsubsync.py
+++ b/ffsubsync/ffsubsync.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 import argparse
 from datetime import datetime
 import logging
diff --git a/ffsubsync/ffsubsync_gui.py b/ffsubsync/ffsubsync_gui.py
index a8c7ba1..b29607c 100755
--- a/ffsubsync/ffsubsync_gui.py
+++ b/ffsubsync/ffsubsync_gui.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 import logging
 import os
 import sys
diff --git a/ffsubsync/file_utils.py b/ffsubsync/file_utils.py
index cfb3867..2aa7a9a 100644
--- a/ffsubsync/file_utils.py
+++ b/ffsubsync/file_utils.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*- 
+from __future__ import annotations 
 import six
 import sys
 
diff --git a/ffsubsync/generic_subtitles.py b/ffsubsync/generic_subtitles.py
index 65c3729..a293eab 100644
--- a/ffsubsync/generic_subtitles.py
+++ b/ffsubsync/generic_subtitles.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 import copy
 from datetime import timedelta
 import logging
diff --git a/ffsubsync/sklearn_shim.py b/ffsubsync/sklearn_shim.py
index d127e6a..f9d060d 100644
--- a/ffsubsync/sklearn_shim.py
+++ b/ffsubsync/sklearn_shim.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 """
 This module borrows and adapts `Pipeline` from `sklearn.pipeline` and
 `TransformerMixin` from `sklearn.base` in the scikit-learn framework
diff --git a/ffsubsync/speech_transformers.py b/ffsubsync/speech_transformers.py
index 21a042a..ead16de 100644
--- a/ffsubsync/speech_transformers.py
+++ b/ffsubsync/speech_transformers.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 from contextlib import contextmanager
 import logging
 import io
diff --git a/ffsubsync/subtitle_parser.py b/ffsubsync/subtitle_parser.py
index 92a01db..74a7b5b 100755
--- a/ffsubsync/subtitle_parser.py
+++ b/ffsubsync/subtitle_parser.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 from datetime import timedelta
 import logging
 from typing import TYPE_CHECKING
diff --git a/ffsubsync/subtitle_transformers.py b/ffsubsync/subtitle_transformers.py
index fbb498b..f18151d 100644
--- a/ffsubsync/subtitle_transformers.py
+++ b/ffsubsync/subtitle_transformers.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 from datetime import timedelta
 import logging
 import numbers
diff --git a/ffsubsync/version.py b/ffsubsync/version.py
index fadd2c7..ef01e83 100644
--- a/ffsubsync/version.py
+++ b/ffsubsync/version.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 import os
 from ffsubsync.constants import SUBSYNC_RESOURCES_ENV_MAGIC
 from ffsubsync._version import get_versions
diff --git a/tests/test_alignment.py b/tests/test_alignment.py
index 13d60d0..9aa476e 100644
--- a/tests/test_alignment.py
+++ b/tests/test_alignment.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*- 
+from __future__ import annotations 
 import pytest
 from ffsubsync.aligners import FFTAligner, MaxScoreAligner
 
diff --git a/tests/test_integration.py b/tests/test_integration.py
index dd470a5..7f36769 100644
--- a/tests/test_integration.py
+++ b/tests/test_integration.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 
 import filecmp
 import os
diff --git a/tests/test_misc.py b/tests/test_misc.py
index 135f4ae..3168493 100644
--- a/tests/test_misc.py
+++ b/tests/test_misc.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*-
+from __future__ import annotations
 import pytest
 from ffsubsync.version import make_version_tuple
 
diff --git a/tests/test_subtitles.py b/tests/test_subtitles.py
index ae6f42b..29ffa21 100644
--- a/tests/test_subtitles.py
+++ b/tests/test_subtitles.py
@@ -1,4 +1,4 @@
-# -*- coding: future_annotations -*- 
+from __future__ import annotations 
 import itertools
 from io import BytesIO
 from datetime import timedelta