Prefer camelCase to snake_case

I was reading through a previous pull request and saw the request for
the use of camelCase instead of snake_case. This file was pointed to as
needing to be updated. Here's the update :)

hammerspoon/control-escape.lua

@@ -3,41 +3,41 @@
 --   https://gist.github.com/arbelt/b91e1f38a0880afb316dd5b5732759f1
 --   https://github.com/jasoncodes/dotfiles/blob/ac9f3ac/hammerspoon/control_escape.lua
 
-send_escape = false
-last_mods = {}
+sendEscape = false
+lastMods = {}
 
-control_key_handler = function()
-  send_escape = false
+controlKeyHandler = function()
+  sendEscape = false
 end
 
-control_key_timer = hs.timer.delayed.new(0.15, control_key_handler)
+controlKeyTimer = hs.timer.delayed.new(0.15, controlKeyHandler)
 
-control_handler = function(evt)
-  local new_mods = evt:getFlags()
-  if last_mods["ctrl"] == new_mods["ctrl"] then
+controlHandler = function(evt)
+  local newMods = evt:getFlags()
+  if lastMods["ctrl"] == newMods["ctrl"] then
     return false
   end
-  if not last_mods["ctrl"] then
-    last_mods = new_mods
-    send_escape = true
-    control_key_timer:start()
+  if not lastMods["ctrl"] then
+    lastMods = newMods
+    sendEscape = true
+    controlKeyTimer:start()
   else
-    if send_escape then
+    if sendEscape then
       keyUpDown({}, 'escape')
     end
-    last_mods = new_mods
-    control_key_timer:stop()
+    lastMods = newMods
+    controlKeyTimer:stop()
   end
   return false
 end
 
-control_tap = hs.eventtap.new({hs.eventtap.event.types.flagsChanged}, control_handler)
-control_tap:start()
+controlTap = hs.eventtap.new({hs.eventtap.event.types.flagsChanged}, controlHandler)
+controlTap:start()
 
-other_handler = function(evt)
-  send_escape = false
+otherHandler = function(evt)
+  sendEscape = false
   return false
 end
 
-other_tap = hs.eventtap.new({hs.eventtap.event.types.keyDown}, other_handler)
-other_tap:start()
+otherTap = hs.eventtap.new({hs.eventtap.event.types.keyDown}, otherHandler)
+otherTap:start()