### Please describe the problem.
When adding a YouTube channel via importfeed I get the error:

```
  warning: bad feed content; no enclosures to download
```

### What steps will reproduce the problem?
1. `cd $(mktemp -d)`
2. `git init && git annex init`
3. `git annex importfeed https://www.youtube.com/feeds/videos.xml\?playlist_id\=PLoXkGkpREHNBY9KtkdqhBIfx-waIGSKet`
4. Get sad.  :-(

(URL [https://www.youtube.com/feeds/videos.xml?playlist_id=PLoXkGkpREHNBY9KtkdqhBIfx-waIGSKet](https://www.youtube.com/feeds/videos.xml?playlist_id=PLoXkGkpREHNBY9KtkdqhBIfx-waIGSKet) looks like a feed to Firefox)


### What version of git-annex are you using? On what operating system?
OSX (MacOS?) - installed via homebrew

    git-annex version: 6.20161210
    build flags: Assistant Webapp Pairing Testsuite S3(multipartupload)(storageclasses) WebDAV FsEvents XMPP ConcurrentOutput TorrentParser MagicMime Feeds Quvi
    key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 SHA1E SHA1 MD5E MD5 WORM URL
    remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external

Debian Jessie - installed via apt-get (ASIDE: why is the apt-get version sooooo old?)

    git-annex version: 5.20141125
    build flags: Assistant Webapp Webapp-secure Pairing Testsuite S3 WebDAV Inotify DBus DesktopNotify XMPP DNS Feeds Quvi TDFA CryptoHash
    key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 WORM URL
    remote types: git gcrypt S3 bup directory rsync web webdav tahoe glacier ddar hook external


### Additional information

Running with `--debug` (see below) seems to indicate that the feed downloads correctly, but it is the parsing that is failing.  I don't know what command is being run to parse the feed though.


``` shell
git annex importfeed --debug https://www.youtube.com/feeds/videos.xml\?playlist_id\=PLoXkGkpREHNBY9KtkdqhBIfx-waIGSKet
```
results in:

``` shell
(checking known urls...) [2016-12-19 12:39:36.387714] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","show-ref","git-annex"]
[2016-12-19 12:39:36.392367] process done ExitSuccess
[2016-12-19 12:39:36.392496] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","show-ref","--hash","refs/heads/git-annex"]
[2016-12-19 12:39:36.396484] process done ExitSuccess
[2016-12-19 12:39:36.406716] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","ls-files","--stage","-z","--","."]
[2016-12-19 12:39:36.412674] process done ExitSuccess
importfeed https://www.youtube.com/feeds/videos.xml?playlist_id=PLoXkGkpREHNBY9KtkdqhBIfx-waIGSKet
[2016-12-19 12:39:36.413555] call: wget ["--clobber","-c","-O","/var/folders/l0/l60294_970b9fh46062znm0r0000gn/T/feed16807282475249","https://www.youtube.com/feeds/videos.xml?playlist_id=PLoXkGkpREHNBY9KtkdqhBIfx-waIGSKet","--user-agent","git-annex/6.20161210"]
--2016-12-19 12:39:36--  https://www.youtube.com/feeds/videos.xml?playlist_id=PLoXkGkpREHNBY9KtkdqhBIfx-waIGSKet
Resolving www.youtube.com... 216.58.199.78, 2404:6800:4006:806::200e
Connecting to www.youtube.com|216.58.199.78|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/xml]
Saving to: ‘/var/folders/l0/l60294_970b9fh46062znm0r0000gn/T/feed16807282475249’

/var/folders/l0/l60294_970b9fh46062znm0r0000gn/T/f     [ <=>                                                                                                             ]  23.81K  --.-KB/s    in 0.02s

2016-12-19 12:39:37 (1.22 MB/s) - ‘/var/folders/l0/l60294_970b9fh46062znm0r0000gn/T/feed16807282475249’ saved [24386]

[2016-12-19 12:39:37.595869] process done ExitSuccess

  warning: bad feed content; no enclosures to download
ok
```

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

Yes, for years.  I donated to fund the dev and proudly display my git-annex stickers!

> This is now fixed in feed's git repository, and will be in the next
> release of feed after the current 0.3.11.1 release. [[done]] --[[Joey]]