Fix conflict between matplotlib=3.0.3 and salmon>1.0.0
Fix conflict between matplotlib=3.0.3 and salmon>1.0.0

Also updated multiqc which should make the pinned matplotlib dependency
obsolete.

ewels/NGI-RNAseq,ewels/NGI-RNAseq,ewels/NGI-RNAseq,ewels/NGI-RNAseq,ewels/NGI-RNAseq