Merge branch 'RELEASE_3_8'

* RELEASE_3_8:
  bump x.y.z versions to even y prior to creation of RELEASE_3_8 branch

DESCRIPTION

 Package: splatter
 Type: Package
 Title: Simple Simulation of Single-cell RNA Sequencing Data
-Version: 1.5.8
+Version: 1.6.0
 Date: 2018-10-22
 Author: Luke Zappia
 Authors@R: