fix critical timer typo and make timer work

src/main.lua

@@ -1,15 +1,23 @@
-local utility = require "lib.utility"
 local progress_bar = require "lib.progress_bar"
+local timer = require "lib.timer"
+local utility = require "lib.utility"
 
 -- test progress_bar
 local window_width, window_height = love.graphics.getDimensions()
 local progress_bar_height = 30 -- TODO should not be hardcoded
-local test = progress_bar(0, window_height - progress_bar_height, window_width, progress_bar_height)
-test:set_text("This is a test text string of significant length. It exists to test printing over a progress bar.")
-test:set_progress(math.random())
+local test_bar = progress_bar(0, window_height - progress_bar_height, window_width, progress_bar_height)
+test_bar:set_text("This is a test text string of significant length. It exists to test printing over a progress bar.")
+-- test:set_progress(math.random())
+
+local test_timer = timer.every(1, function() end) -- TODO consider making timer not need a function; cause I don't here!
+
+love.update = function(dt)
+  timer.update(dt)
+  test_bar:set_progress(test_timer.run_time)
+end
 
 love.draw = function()
-  test:draw()
+  test_bar:draw()
 end
 
 love.keypressed = function(key)