The capacitor on pin 5 is used to filter the internal control voltage, it is a good idea to include it.
The circuit posted by @Dillon1337 uses the output pin to control the charge/discharge instead of using the resistor and pin 7. Although this can work well it can also cause problems, in general it is not a good idea. See this post for more information.
https://ceforum.discoursehosting.net/t/aleggeups-getting-to-blinky-build-log/211/17?u=1.21gigawatts