not sort import gi and add isort to travis

.travis.yml

@@ -6,8 +6,9 @@ python:
 install:
     - sudo apt-get update -q
     - sudo apt-get install intltool desktop-file-utils
-    - pip3 install coverage minimock pycodestyle
+    - pip3 install coverage minimock pycodestyle isort
     - python3 tools/localdepends.py
 script:
+    - isort -c -rc
     - pycodestyle share src/gpodder tools bin/* *.py
     - make releasetest

share/gpodder/extensions/notification-win32.py

@@ -48,12 +48,12 @@ import logging
 import os
 import os.path
 
-import gi
-from gi.repository import Gtk
-
 import gpodder
 
-gi.require_version('Gtk', '3.0')
+import gi  # isort:skip
+gi.require_version('Gtk', '3.0')  # isort:skip
+from gi.repository import Gtk  # isort:skip
+
 
 logger = logging.getLogger(__name__)
 

src/gpodder/gtkui/draw.py

@@ -27,12 +27,12 @@ import io
 import math
 
 import cairo
-import gi
-from gi.repository import Gdk, GdkPixbuf, Gtk, Pango, PangoCairo
 
 import gpodder
 
-gi.require_version('PangoCairo', '1.0')
+import gi  # isort:skip
+gi.require_version('PangoCairo', '1.0')  # isort:skip
+from gi.repository import Gdk, GdkPixbuf, Gtk, Pango, PangoCairo  # isort:skip
 
 
 class TextExtents(object):

src/gpodder/gtkui/main.py

@@ -39,8 +39,6 @@ import dbus
 import dbus.glib
 import dbus.mainloop
 import dbus.service
-import gi
-from gi.repository import Gdk, GdkPixbuf, Gio, GLib, GObject, Gtk, Pango
 
 import gpodder
 from gpodder import (common, core, download, extensions, feedcore, my, opml,
@@ -66,7 +64,10 @@ from gpodder.gtkui.services import CoverDownloader
 from gpodder.gtkui.widgets import SimpleMessageArea
 from gpodder.model import PodcastEpisode, check_root_folder_path
 
-gi.require_version('Gtk', '3.0')
+import gi  # isort:skip
+gi.require_version('Gtk', '3.0')  # isort:skip
+from gi.repository import Gdk, GdkPixbuf, Gio, GLib, GObject, Gtk, Pango  # isort:skip
+
 
 logger = logging.getLogger(__name__)
 

tools/win_installer/misc/depcheck.py

@@ -17,10 +17,9 @@ import subprocess
 import sys
 from multiprocessing import Process, Queue
 
-import gi
-from gi.repository import GIRepository
-
-gi.require_version("GIRepository", "2.0")
+import gi  # isort:skip
+gi.require_version("GIRepository", "2.0")  # isort:skip
+from gi.repository import GIRepository  # isort:skip
 
 
 def _get_shared_libraries(q, namespace, version):