updated Codon to v0.18.0

updated lisp timing

Common Lisp implementation of Sudoku (#76)

changed the labels in the table for clarity

javascript compatible with GraalJS

removed the outdated result figure

added bedcov in ruby; updated timing

added Graal python/ruby timing

added timing for bedcov in swift

bedcov in swift

space to tab for matmul.cs

added bedcov in c#; sped up sudoku in c#

optimized bedcov.java

added bedcov.java

bedcov.d timing (#75); plot relative timing