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update list comprehension readme

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`@@ -7,17 +7,19 @@ In a UNIX terminal, run:`
`7`	`7`
`8`	`8`	```
`9`	`9`	`time python list-append-loop.py`
`10`		-```
	`10`	`+`
`11`	`11`	`real 0m11.381s`
`12`	`12`	`user 0m10.553s`
`13`	`13`	`sys 0m0.824s`
	`14`	+```
`14`	`15`
`15`	`16`	```
`16`	`17`	`time python list-comp.py`
`17`		-```
	`18`	`+`
`18`	`19`	`real 0m4.228s`
`19`	`20`	`user 0m3.428s`
`20`	`21`	`sys 0m0.800s`
	`22`	+```
`21`	`23`
`22`	`24`
`23`	`25`	`Here we see that the list comprehension was almost 3x as fast`
`@@ -31,24 +33,32 @@ numbers with the range() function, we can actually just cast the result`
`31`	`33`	`of the range() function to a list and get even faster speed than the`
`32`	`34`	`list comprehension.`
`33`	`35`
	`36`	+```
	`37`	`+time python cast-list.py`
	`38`	`+`
	`39`	`+real 0m2.988s`
	`40`	`+user 0m2.176s`
	`41`	`+sys 0m0.812s`
	`42`	+```
	`43`	`+`
`34`	`44`	`To show a more practical example where you can't just cast it:`
`35`	`45`
`36`	`46`	```
`37`	`47`	`time python list-append-loop2.py`
`38`		-```
`39`	`48`
`40`	`49`	`real 0m29.756s`
`41`	`50`	`user 0m28.875s`
`42`	`51`	`sys 0m0.880s`
	`52`	+```
`43`	`53`
`44`	`54`
`45`	`55`	```
`46`	`56`	`time python list-comp2.py`
`47`		-```
`48`	`57`
`49`	`58`	`real 0m21.932s`
`50`	`59`	`user 0m21.031s`
`51`	`60`	`sys 0m0.900s`
	`61`	+```
`52`	`62`
`53`	`63`	`In this practical example, we see that the list comprehension finished`
`54`	`64`	`in about 2/3 of the time it took the for loop append() method, still`

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