v3.4.2

BioSequences v3.4.2

Diff since v3.4.1

Merged pull requests:

• Add more optimised find methods for BioSequences (#331) (@jakobnissen)
• Improve GC counting code (#332) (@jakobnissen)
• Improve bit-twiddling for counting (#335) (@jakobnissen)

Closed issues:

• Add optimised find functions (#330)