  * Use macros for formatting integer types instead of casting to a specific 
    type.
    
  * Removed unneeded 'siridb_mutex' from heart-beat task. 
  
  * Fixed possible double free on socket. (see issue #39)
  
  * Fixed reading an alternative buffer path from the configuration file.
    (issue #40)
    
  * Fixed dropping shards when followed by an optimize task. (issue #42) 