Update viewport-units.json

tested vh on iOS 8 with an iPhone 5S and iPhone 6. It works like expected; shows a different result than my iPhone 4 with iOS 7
data update
1.0.30000005
Merge pull request #770 from wheressyb/patch-2

Update viewport-units.json
data update
1.0.30000006
data update
1.0.30000007
stats #n example

https://github.com/Fyrd/caniuse/pull/773#issuecomment-59599791
data update
1.0.30000008
data update
1.0.30000009
data update
1.0.30000010
Merge pull request #775 from tomByrer/patch-3

stats #n example
data update
1.0.30000011
Android Browser 4.4 calc() support

Android Browser 4.4 lacks the ability to multiply and divide values.
This means `calc(100vw - 20px)` will work but `calc(100vw / 2)` or `calc((100vw - 30px) * 250 / 715)` (actually used in my fluid layouts!) will not work.
data update