Enhancement for better custom error message

Custom error message for definition

• Support custom error message for definition
• 'message' instruction has been renamed to 'error_message' (Breaking change)

Fixed regression problem caused by #217

v1.6.1

Fixed regression problem caused by #217

New features

• Added [...]i and [^...]i (Fix #220)
• Removed peg::parse_error and introduced predicate action

Some new features and bug fixes

• Profiler support
• Infinite loop problem (#211, #213)
• Automatic EOI support
• Support C++20 char8_t

Bug fixes and profile feature

• Improved error report for literal string with %word
• Fix problem with undefined back reference (#206)
• Profile feature (#200)

Error report problem and concise trace mode support

• Updated concise trace mode
• Fixed #202 again

Better error report

Odd unexpected #202
Infinite loop problem with %whitespace #205

Improvements

Allow more than one instruction
Missing mention to "rep" in operators list in README (#193)
Error parsing valid charset class (#195)
Added '\f' and '\v'
Taking too much time to load/parse grammar (#197)

Performance improvement

v1.3.9

Performance improvement