Add `none` formatting option

Fix encoder panic when last value is empty

Fix a panic in the encoder due to trying to write an empty value at
the end of a line that contains multi-byte characters.

Return error in the error branch

This change fixes the issue when there is an error in decoding, where
the original code would return no error and false for ok. That would
confuse the calling function.

Update versions of go used to run tests

Update the versions of Go used to run tests from 1.13 through 1.17 to
1.15 through 1.19

Fix incorrect error for very long lines (#48)

Fix a bug where an io.EOF error would incorrectly be returned when a
line of data contains bufio.MaxScanTokenSize characters or greater.
The decoder will now return ErrTooLong when a line is too long to
decode.

Fixes #47

Cache the most recently used valueEncoder to avoid a hash table lookup

Add multibyte character support to encoder

Implement the bool type (#40)

This implements encoding and decoding bools.

Add configurable formatting (#37)

Make decodee lineTerminator customisable (#31)

Make line separator customisable