message: Update the readme with floating point
diff: [![codecov badge]][codecov]
  [![license badge]][Apache License, Version 2.0]
  -Fizzy aims to be a fast integer-only WebAssembly interpreter written in C++.
  +Fizzy aims to be a fast, deterministic, and pedantic WebAssembly interpreter written in C++.
  ## Goals
  @@ -17,14 +17,17 @@ I) Code quality
  - [ ] Easily embeddable (*and take part of the standardisation of the "C/C++ embedding API"*)
  II) Simplicity
  +- [x] Only implement WebAssembly 1.0 (and none of the proposals)
  - [x] Interpreter only
  -- [x] Provide no support for floating point operations (initially)
  - [x] Support only WebAssembly binary encoding as an input (no support for the text format (`.wat`/`.wast`))
  III) Conformance
  -- [ ] Should pass the official WebAssembly test suite
  +- [x] Should have 99+% unit test coverage
  +- [x] Should pass the official WebAssembly test suite
  +- [x] Should have stricter tests than the official test suite
  IV) First class support for determistic applications (*blockchain*)
  +- [ ] Support canonical handling of floating point (i.e. NaNs stricter than in the spec)
  - [ ] Support an efficient big integer API (256-bit and perhaps 384-bit)
  - [ ] Support optional runtime metering in the interpreter
  - [ ] Support enforcing a call depth bound
  