docs: README.md invisible fixes (#228)
docs: README.md invisible fixes (#228)

- Changed code block language from `js` to `sh`, since it's more appropriate for that code block. `sh` alias for Shell was picked for consistency with other code blocks (also `sh`) and because it's valid [supported by linguist](https://github.com/github/linguist/blob/master/lib/linguist/languages.yml#L4459) (which is used by GitHub) alias for Shell. This code block was added by 11bf7ded1c2a4da6e76b857dca94e2c4befa3850 commit.
- Removed unnecessary *second* empty line from the end of the file. One empty line should be enough. Extra empty line was added by d4f6aaaed21a98c773bf6ca2c335f719cd39f70b commit.
google/gts,google/gts