Changelog for from-1.0.0.1

Changelog for `from`

All notable changes to this project should be documented in this file.

The format is based on Keep a Changelog, and this project adheres to the Haskell Package Versioning Policy.

Split the test code into ordinary test and code generation test. The code generation test will not be run by default (by Hackage or Stackage, for example).

Initial release.

Typeclasses From and TryFrom.
Instances of From for some fundamental type-mappings in base:
- All types in Data.Int and Data.Word can be both the source and the destination of the conversion.
- The types Float and Double can be the destination, but not the source. So from :: Int32 -> Float exists, while from :: Float -> Int32 does not.
- That's it. We begin with minimal instances intentionally. For example, there is no instance From Int String. This is because it is tricky (often impossible) to selectively import instances, especially when the module dependency graph is complicated. We'd need to be careful about adding instances.