Precompile Lua into bytecode before running it (see COMPILE)

COMPILE

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+                     ___________________
+                    < Manually building >
+                     -------------------
+
+Since matrix-send uses Lua, an interpreted programming language,
+building is not necessary; you could just move matrix-send.lua to
+/usr/local/bin and be done with it. However, for additional speed,
+the Makefile precompiles it to Lua bytecode using
+luac <https://www.lua.org/manual/5.4/luac.html> which is included
+in the Lua distribution. To do this yourself, follow these steps:
+
+ => Create the shebang
+
+In order to be run by a shell, the compiled bytecode needs a
+shebang at the start. To do this, run this command:
+
+	printf '#!/usr/bin/env lua\n' > matrix-send
+
+
+ => Precompile
+
+Now, let's append the bytecode to the file:
+
+	luac -o - matrix-send.lua >> matrix-send
+
+
+ => Mark as an executable
+
+Finally, mark the file as executable:
+
+	chmod +x matrix-send
+
+The file `matrix-send` is now ready to be run by a shell.
+
+# vi: ft=txt