v0.0.5

CHANGES:

• Update the README.md (@craigfe, #9)
• Add a representation of 63-bit integers (@craigfe, #9)
• Allow to compile fuzzers on 32-bit architectures (@dinosaure, #9)
• Add encode / decode functions for integers (@craigfe, #9)
• Fix optint about sign and cast on all architectures (@dinosaure, #9)
• breaking changes, rename and handle properly sign-bit:
  {of,to}_int become {of,to}_unsigned_int
{of,to}_int32 become {of,to}_unsigned_int32
  Previous functions handle sign-bit correctly