README: add Lua example code for auto-running PackerCompile #1221
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Many users come to Packer because they can then migrate to a complete Lua-based config for NeoVim.
Thus it makes sense to have a code example not only in Vimscript for auto-running PackerCompile on changes to
plugins.lua
but also an example in Lua.Reference: https://neovim.io/doc/user/lua-guide.html#lua-guide-autocommands-group