Add 'Parser#notFollowedBy'
Remove some array utility functions

They are almost not used in the library
Define 'choice' as a synonym for 'msum'
Define 'count' as a synonym for 'replicateM'
Make 'ParseError.merge' use 'ParseError#isUnknown'
Add monadic methods of 'Parser'
Add methods of Parser

‘Parser#manyChar’ and ‘Parser#manyChar1’
Add expr module

It includes a helper to parse expressions
Fix missing semicolon
Add test for 'Operator'
Add methods of Parser

‘Parser#map’ (like ‘Array#map’) and ‘Parser#ap’
Add partial tests for 'buildExpressionParser'

for unary operators
Add partial test for 'buildExpressionParser'

priority of postfix operators
Fix 'ParseError.merge'

That was completely inverse :(

Fixing the tests will follow.
Fix the tests

Relates to correction of ‘ParseError.merge’
Fix the tests for ‘ltor’ and ‘rtol’
Modify 'lookAhead'
Add 'Parser#lookAhead'
Add partial test for 'buildExpressionParser'

for non associative operators
Add partial test for 'buildExpressionParser'

for right associative operators