Bump ua-parser-js from 0.7.23 to 0.7.28 in /pistache.io

Bumps [ua-parser-js](https://github.com/faisalman/ua-parser-js) from 0.7.23 to 0.7.28.
- [Release notes](https://github.com/faisalman/ua-parser-js/releases)
- [Commits](https://github.com/faisalman/ua-parser-js/compare/0.7.23...0.7.28)
Signed-off-by: dependabot[bot] <support@github.com>

Check if `-latomic` is needed

Fixes #916

Use GTest imported target in tests/CMakeLists.txt

Travis cleanups: install `libgtest-dev`, remove unused apt sources

…unused apt sources

Add thread-safe logger to http server test

test-compilation-and-link.sh: Add -std=c++17 -Wall -Werror to compile and link DEP-8 test...

Upgrade to C++17 and use std::optional

More traces to Peer class, http server test and change id generation

Make Travis less verbose

Fixes #858

Replace `Pistache::Optional` with `std::optional`

So that Travis CI builds do not fail if systemctl returns a bad status
code

But preserving error logs

Update clang-format in Travis

AllowShortBlocksOnASingleLine: Empty was added in clang-format 10

Fix warning: backslash-newline at end of file

include/pistache/meson.build: Fixed missing meta.h...

Fix pkg-config usage with Meson in Readme

Add project status in the Readme

Closes #894

Reapply #890

See #890

Revert "Meson improvements"

Meson improvements

…an/control