0.6.0 fails on Windows

I compiled 0.6.0 for Windows without issue, and uploaded the executables to https://github.com/rasa/git-crypt/releases

I ran the commands listed on https://github.com/AGWA/git-crypt/wiki/Create-a-Repostiory in both Linux and Windows. In Linux, it-just-works. On Windows, when I run `git-crypt status`, I get:
````
encrypted: myKeys.secure *** WARNING: staged/committed version is NOT ENCRYPTED! ***
encrypted: mySecret.txt *** WARNING: staged/committed version is NOT ENCRYPTED! ***
encrypted: passwords.secure *** WARNING: staged/committed version is NOT ENCRYPTED! ***
````
and when I run `git-crypt unlock secret.key`, I get:
````
git-crypt: Warning: file not encrypted
git-crypt: Run 'git-crypt status' to make sure all files are properly encrypted
git-crypt: If 'git-crypt status' reports no problems, then an older version of
git-crypt: this file may be unencrypted in the repository's history. If this
git-crypt: file contains sensitive information, you can use 'git filter-branch'
git-crypt: to remove its old versions from the history.
git-crypt: Warning: file not encrypted
git-crypt: Run 'git-crypt status' to make sure all files are properly encrypted
git-crypt: If 'git-crypt status' reports no problems, then an older version of
git-crypt: this file may be unencrypted in the repository's history. If this
git-crypt: file contains sensitive information, you can use 'git filter-branch'
git-crypt: to remove its old versions from the history.
git-crypt: Warning: file not encrypted
git-crypt: Run 'git-crypt status' to make sure all files are properly encrypted
git-crypt: If 'git-crypt status' reports no problems, then an older version of
git-crypt: this file may be unencrypted in the repository's history. If this
git-crypt: file contains sensitive information, you can use 'git filter-branch'
git-crypt: to remove its old versions from the history.
````
Here's the complete test script:
````
git init
touch README.md
git add README.md
git commit -m "Initial Commit"
touch myFile.txt mySecret.txt passwords.secure myKeys.secure
git add -A
git commit -am "Added some files"
git-crypt init
touch .gitattributes
echo mySecret.txt filter=git-crypt diff=git-crypt >.gitattributes
echo *.secure filter=git-crypt diff=git-crypt >>.gitattributes
git add -A
git-crypt status
git commit -m "Added .gitattributes for git-crypt"
git-crypt status
git-crypt add-gpg-user D74CA7EF275BD151
git-crypt status
git-crypt export-key secret.key
git-crypt unlock secret.key
echo secret1 >myKeys.secure
echo secret2 >passwords.secure
echo secret3 >mySecret.txt
git add -A
git ci -m "encrypted files"
cat mySecret.txt
git-crypt lock
cat mySecret.txt
````