Bump to version 0.5.6
    
    * Add internal errors of IA32_MC4_STATUS for Haswell
    * Use MCA error msg as error_msg
    * Unnecessary comma for empty mc_location string
    * Remove a space from mcgstatus_msg
    * Add support to log Local Machine Check Exception (LMCE)
    
    Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>