_winreg in python3 has been changed to winreg. Update imports.

DeDRM_plugin/ignoblekey.py

@@ -95,7 +95,7 @@ def getNookLogFiles():
     logFiles = []
     found = False
     if iswindows:
-        import _winreg as winreg
+        import winreg
 
         # some 64 bit machines do not have the proper registry key for some reason
         # or the python interface to the 32 vs 64 bit registry is broken

DeDRM_plugin/kindlekey.py

@@ -190,7 +190,6 @@ if iswindows:
         create_unicode_buffer, create_string_buffer, CFUNCTYPE, addressof, \
         string_at, Structure, c_void_p, cast
 
-    # import _winreg as winreg
     import winreg
     MAX_PATH = 255
     kernel32 = windll.kernel32

DeDRM_plugin/simpleprefs.py

@@ -20,7 +20,7 @@ class SimplePrefs(object):
             self.file2key[filename] = key
         self.target = target + 'Prefs'
         if sys.platform.startswith('win'):
-            import _winreg as winreg
+            import winreg
             regkey = winreg.OpenKey(winreg.HKEY_CURRENT_USER, "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders\\")
             path = winreg.QueryValueEx(regkey, 'Local AppData')[0]
             prefdir = path + os.sep + self.target