Add true streaming #96

Job	Run time
windows (lua53, lua5.3, 5.3, /mingw64/include/lua5.3/)	2m 37s
windows (lua, lua, 5.4, /mingw64/include/)	2m 48s
windows (luajit, luajit, 5.1, /mingw64/include/luajit-2.1/)	2m 53s
unix (5.1, ubuntu-latest)	54s
unix (5.1, macos-latest)	2m 13s
unix (5.2, ubuntu-latest)	2m 37s
unix (5.2, macos-latest)	1m 54s
unix (5.3, ubuntu-latest)	2m 8s
unix (5.3, macos-latest)	1m 53s
unix (5.4.7, ubuntu-latest)	55s
unix (5.4.7, macos-latest)	1m 55s
unix (luajit-openresty, ubuntu-latest)	44s
unix (luajit-openresty, macos-latest)	2m 5s
	25m 36s

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