Updated problems to be more in line with conventions

Problem13.lua

@@ -1,7 +1,7 @@
 --ProjectEuler/lua/Problem13.lua
 --Matthew Ellison
 -- Created: 02-07-19
---Modified: 03-28-19
+--Modified: 06-19-20
 --Work out the first ten digits of the sum of the following one-hundred 50-digit numbers
 --[[
 37107287533902102798797998220837590246510135740250
@@ -108,7 +108,7 @@
 --All of my requires, unless otherwise listed, can be found at https://bitbucket.org/Mattrixwv/luaClasses
 --I used the bigint library from https://github.com/empyreuma/bigint.lua
 --[[
-	Copyright (C) 2019  Matthew Ellison
+	Copyright (C) 2020  Matthew Ellison
 
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU Lesser General Public License as published by
@@ -129,10 +129,10 @@ require "Stopwatch"
 local bigint = require "bigint"
 
 
-timer = Stopwatch:create();
+local timer = Stopwatch:create();
 timer:start();
 
-NUMBERS = {};
+local NUMBERS = {};
 NUMBERS[#NUMBERS+1] = bigint.new("37107287533902102798797998220837590246510135740250")
 NUMBERS[#NUMBERS+1] = bigint.new("46376937677490009712648124896970078050417018260538")
 NUMBERS[#NUMBERS+1] = bigint.new("74324986199524741059474233309513058123726617309629")