Go the distance even faster

Speed

• major fix to CPU parallelisation - far better scaling
• -x maxdiff option to short-circuit distant pairs
• -L option to only calculate the lower triangle of the matrix (2x faster)

Features

• -t option to add header line to MOLTEN output
• migration from (broken) TRAVIS to Github Actions CI w/ BATS
• Improved documentation
• Update kseq.h to support larger files.

New Contributors

• @boasvdp made their first contribution in #54
• @kapsakcj made their first contribution in #45
• @matt-sd-watson made their first contribution in #48

Full Changelog: v0.8.2...v1.2.0