Fix Show instances

• This release fixes a Show that causes infinite recursion, see #4.
• The Stack resolver is increased to lts-19, which is GHC 9.0.
• ghc-options: -O2 is disabled by default.

This release places evm-opcodes-0.1.2 on Hackage:

https://hackage.haskell.org/package/evm-opcodes

Loosen dependency bounds

When they become available on Stackage:

• Make constraints compatible with base-4.16
• Make constraints compatible with text-2.0

This release places evm-opcodes-0.1.1 on Hackage:

https://hackage.haskell.org/package/evm-opcodes

Initial release

This release places evm-opcodes-0.1.0 on Hackage:

https://hackage.haskell.org/package/evm-opcodes