Changes from 5.19.0:
- Table:
  - CHANGED: switch to pre-calculated distances for table responses for large speedup and 10% memory increase. #5251
  - ADDED: new parameter fallback_speed which will fill null cells with estimated value #5257
  - CHANGED: Remove API check for matrix sources/destination length to be less than or equal to coordinates length. #5298
  - FIXED: Fix crashing bug when using fallback_speed parameter with more sources than destinations. #5291
- Features:
  - ADDED: direct mmapping of datafiles is now supported via the --mmap switch. #5242
  - REMOVED: the previous --memory_file switch is now deprecated and will fallback to --mmap #5242
  - ADDED: Now publishing Node 10.x LTS binary modules #5246
- Windows:
  - FIXED: Windows builds again. #5249
- Docker:
  - CHANGED: switch from Alpine Linux to Debian Buster base images #5281