Lua 3.0

Lua 2.5

Lua 2.4

Lua 2.2

Lua 2.1

Lua 1.1

Optimization for 'n^2'

Squares are much more common than other exponentiations, and 'n*n' is
much more efficient than 'pow'.

Release 5.4.2

Merge branch 'master' of https://github.com/lua/lua

Adding file README.md to local repository.

Release 5.4.1