Updated docs

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docs/objects/Basalt/update.md

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+## basalt.update
+Calls the draw and event handler once - this gives more flexibility about which events basalt should process. For example you could filter the terminate event.
+Which means you have to pass the events into basalt.update.
+
+#### Parameters: 
+1. `string` The event to be received 
+2. `...` Additional event variables to capture
+
+#### Usage:
+* Creates and starts a custom update cycle
+```lua
+local mainFrame = basalt.createFrame()
+local aButton = mainFrame:addButton():setPosition(2,2)
+while true do
+    local ev = table.pack(os.pullEventRaw())
+    basalt.update(table.unpack(ev))
+end
+```