message: README: remove todos (mostly done)
diff: @@ -43,17 +43,3 @@ $ ./configure
  $ make
  $ ./run
  ```
  -
  -
  -TODO
  -----
  -
  -- bg thread
  -- dump out strings
  -- interpose sig* functions and make sure application doesn't override our handlers
  -- merge adjacent mappings
  -- matching algorithm
  -- keep more stats; clock_gettime(CLOCK_MONOTONIC) of last free time
  -- some sort of LRU sorting of miniheaps -- when freeing move to end
  - (don't consider meshing heaps that have been active in the last... 5
  - ms or something)
  