Derive calibre version tuple from __version__ string

DeDRM_plugin/__init__.py

@@ -78,7 +78,7 @@ Decrypt DRMed ebooks.
 """
 
 PLUGIN_NAME = u"DeDRM"
-PLUGIN_VERSION_TUPLE = (6, 8, 0)
+PLUGIN_VERSION_TUPLE = tuple([int(x) for x in __version__.split(".")])
 PLUGIN_VERSION = u".".join([unicode(str(x)) for x in PLUGIN_VERSION_TUPLE])
 # Include an html helpfile in the plugin's zipfile with the following name.
 RESOURCE_NAME = PLUGIN_NAME + '_Help.htm'