Update data.txt

Adding Wave Apps
Contributor: Huda Idrees, UX Designer at Wave Apps
    @hidrees
Source: internal headcount

https://medium.com/grace-hopper-2013/cb997a57252#d4d8-b3d509275bf9
Wave apps is 5 out of 23 if you count dev + ops, 5 out of
20 if you exclude ops.
Merge pull request #111 from hidrees/patch-1

Update data.txt