undocumented filename requirement

[chkp-amirtal]

from readme:

create a new file and name it something that makes sense for you.

but this will only work if the filename starts with a capital V, then some numbers, followed by '__', all without spaces.

[chkp-amirtal]

also: thanks for this project! +1 initially found tfmigrate and then found this.

[aleksanderaleksic]

Thanks for the feedback @amirtal-cp , I will update the documentation ASAP