Update History.md regarding ruby-1.8
Update History.md regarding ruby-1.8

rake-compiler/rake-compiler-dock,larskanis/rake-compiler-dock,larskanis/rake-compiler-dock,larskanis/rake-compiler-dock,rake-compiler/rake-compiler-dock,rake-compiler/rake-compiler-dock,rake-compiler/rake-compiler-dock,rake-compiler/rake-compiler-dock