added 33_readingsHistory


git-svn-id: svn://svn.code.sf.net/p/fhem/code@5889 2b470e98-0d58-463d-a4d8-8e2adae1ed80
added 33_readingsHistory


git-svn-id: svn://svn.code.sf.net/p/fhem/code@5890 2b470e98-0d58-463d-a4d8-8e2adae1ed80