Fix trailing whitespaces

[mfederowicz]

cleanup in few files containing trailing whitespace and incorrect end line

no tests needed

[chavacava]

https://unix.stackexchange.com/questions/18743/whats-the-point-in-adding-a-new-line-to-the-end-of-a-file

[mfederowicz]

hmm interesting because it is result of end-of-file-fixer hook from https://github.com/pre-commit/pre-commit-hooks :)

this hook have description:

id: end-of-file-fixer
    name: fix end of files
    description: ensures that a file is either empty, or ends with one newline.

other files *.go in commits have removed last line, so we have a proof that hook not works well :(

[mfederowicz]

ok @chavacava i removed commit related to end of files, and leave related with trailing white spaces :)