v0.2.0 - Multiple feature updates

What's Changed

• fix(normalization): corrects CPM and RPKM implementation by @alsmith151 in #19
• fix(normalization): Corrects RPKM by @alsmith151 in #20
• feat(pileup): use bigtools for bedgraph conversion by @alsmith151 in #21
• fix(bigwig-generation): better scaling factor identification by @alsmith151 in #22
• feat(pileup): enabled stranded bigwig generation by @alsmith151 in #23
• refactor(spikein): remove allow_unknown_mapq option from BamSplitter by @alsmith151 in #24

Full Changelog: v0.1.0...v0.2.0