Version 3.0.0

Many many thanks @lovasoa for the amazing PR #2 — and @rogeriochaves for the code review.

Unfortunately the PR was a couple of weeks idle after a few discussions about readability and about `Int` formatting.

That said this version bump is very opinionated in terms of the discussion:

* There's no `formatInt` and `formatFloat` — just `format` (to make this decision clearer I included the logic of `formatInt` in a `let`/`in` block)
* I refactor function with nested parenthesis with `|>` and `<|` for readability

elm-package.json

@@ -1,5 +1,5 @@
 {
-    "version": "2.0.0",
+    "version": "3.0.0",
     "summary": "Format numbers as pretty strings",
     "repository": "https://github.com/cuducos/elm-format-number.git",
     "license": "BSD3",