Fix typo Unkown to Unknown

Update example in README.md

[#404] Reading past valid address with multisink logger

- Initialising atomic value

See examples at http://stackoverflow.com/q/36320008/706456
This issue was discovered with dr memory tool on Windows platform, Visual Studio 2015 C++ 11

- Initialising atomic value

See examples at http://stackoverflow.com/q/36320008/706456
This issue was discovered with dr memory tool on Windows platform, Visual Studio 2015 C++ 11

Disambiguate fmt logging methods that are using variadic templates.

As variadic template arguments can be zero length, we need to specify that at least one fmt argument is provided, to distinguish these methods from the existing trivial method that takes no fmt arguments.

Without this, static analysers such as ReSharper flag the logging calls as errors.

Update README.md

fmt: update bundled fmt to 3.0.1 (7fa8f8f)

Signed-off-by: Damien Zammit <damien@zamaudio.com>

Use double-braces in std::array initialization.

Don't hardcode '.txt.' log file name suffix (resolve #333)

Signed-off-by: Ľubomír Carik <Lubomir.Carik@gmail.com>

Replace static global std::string arrays by Meyer singletons. 

Required for C++11 support

Add prefix for BUILD_TESTING cmake option