Merge pull request #32 from pre-commit/windows_support

Fix end-of-file-fixer on windows

pre_commit_hooks/end_of_file_fixer.py

diff --git a/pre_commit_hooks/end_of_file_fixer.py b/pre_commit_hooks/end_of_file_fixer.py
index 0698a89..3349d83 100644
--- a/pre_commit_hooks/end_of_file_fixer.py
+++ b/pre_commit_hooks/end_of_file_fixer.py
@@ -16,6 +16,8 @@
     last_character = file_obj.read(1)
     # last_character will be '' for an empty file
     if last_character != b'\n' and last_character != b'':
+        # Needs this seek for windows, otherwise IOError
+        file_obj.seek(0, os.SEEK_END)
         file_obj.write(b'\n')
         return 1