Version 0.2.0

• Add support for slurm_partition runtime attribute.
• Adds support for gpu and gpuCount runtime attributes. The gpu runtime
  attribute is a boolean that indicates whether the task requires a GPU. The
  gpuCount runtime attribute is an integer that indicates the number of GPUs
  required by the task.
• Add support for slurm_constraint runtime attribute.

0.1.0

Initial release with the following features:

• Utilize miniwdl's singularity backend to create a singularity command that
  is then submitted using srun.
• Create a singularity image cache so singularity images are available on
  the cluster nodes.
• Support for cpu, memory and time_minutes runtime attributes.