winfreed.py: fix the "HTTP Error 403: Forbidden" error on some servers

Some servers require the User-Agent header.

This fixes this error:

  Downloading from https://www.sumatrapdfreader.org/dl/SumatraPDF-3.1.2-64-install.exe failed. HTTP Error 403: Forbidden

diff --git a/winfreed.py b/winfreed.py
index 8b674c3..a2b95ab 100755 (executable)
--- a/winfreed.py
+++ b/winfreed.py
@@ -69,7 +69,11 @@ def show(pkg):
 
 def download_file(src_url, dest_dir):
     try:
-        response = urllib2.urlopen(src_url)
+        hdr = {
+            'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0',
+        }
+        request = urllib2.Request(src_url, headers=hdr)
+        response = urllib2.urlopen(request)
     except Exception, e:
         print 'Downloading from', src_url, 'failed.', e
         return