Add User-Agent match for Windows 10 client

[dennisameling]

As fixed in #11, the Windows 10 client has problems with 301 redirects issued by the Apache server. This is what happens:

• Windows requests PROPFIND /Foldername without the trailing slash after /Foldername
• Apache returns a 301 response to /Foldername/, which causes various errors in Windows, like not being able to create folders. In short: Windows can't deal with 301 redirects in WebDAV properly.

By adding an entry to the BrowserMatch list for ^Microsoft-WebDAV-MiniRedir (the Windows 10 WebDAV client), the problem is resolved with redirect-carefully. Please consider merging PR #11 to resolve this issue for Windows 10 users.