Log Message:
py-dulwich: updated to 0.19.2

0.19.2:
BUG FIXES
 * Fix deprecated Index.iterblobs method.

0.19.1:
IMPROVEMENTS
 * Add 'dulwich.mailmap' file for reading mailmap files.
 * Dulwich no longer depends on urllib3[secure]. Instead,
   "dulwich[https]" can be used to pull in the necessary
   dependencies for HTTPS support.
 * Support the `http.sslVerify` and `http.sslCAInfo`
   configuration options.
 * Factor out `dulwich.client.parse_rsync_url` function.
 * Fix repeat HTTP requests using the same smart HTTP client.
 * New 'client.PLinkSSHVendor' for creating connections using PuTTY's plink.exe.
 * Only pass in `key_filename` and `password` to SSHVendor
   implementations if those parameters are set.
   (This helps with older SSHVendor implementations)

API CHANGES
 * Index.iterblobs has been renamed to Index.iterobjects.