Fix: handle single-byte RLP strings, bump to v0.5.14

[samuelarogbonlo]

Fixes the RLP decoder to properly handle single-byte strings and bumps version to 0.5.14. Previously, attempting to decode a single-byte string like "a" would result in the error "RLP string ends with -32 superfluous bytes".

Changes:

• Modified encoder to consistently wrap output in Rlp::Data
• Fixed handling of single-byte strings in RLP encoding/decoding
• Added test case to verify single-byte string handling
• Bumped version from 0.5.13 to 0.5.14

Tests:

• All existing tests pass
• Added new test case for single-byte strings
• Verified fix with direct testing of the failing case:

  Eth::Rlp.decode(Eth::Rlp.encode("a")) # now works correctly

[q9f]

All existing tests pass

I get this:

Failures:

  1) Eth::Util.bin_to_hex .hex_to_bin .bin_to_prefixed_hex raises an error when given invalid string
     Failure/Error: expect { Util.bin_to_hex 1234 }.to raise_error TypeError
       expected TypeError but nothing was raised
     # ./spec/eth/util_spec.rb:78:in `block (3 levels) in <top (required)>'

Finished in 19.72 seconds (files took 0.65699 seconds to load)
296 examples, 1 failure, 3 pending

[q9f]

Closing for now