Changelog for ghc-bignum package

1.3

• Expose backendName
• Add naturalSetBit[#] (#21173), naturalClearBit[#] (#21175), naturalComplementBit[#] (#21181)

1.2

• Moved naturalToDouble# and naturalToFloat# to base package

1.1

• Moved integerToDouble# and integerToFloat# to base package with fixed rounding (#15926, #17231, #17782)
• Added Eq and Ord instances for BigNat (#19647)
• Bump in-tree GMP to version 6.2.1
• Support for autoconf >= 2.70 especially on Windows (#19189)
• Fixed extra-source-files in .cabal file
• Fixed incorrect declaration in .hs-boot file (#19638)