v0.16.0

Add support to config module for on-call schedules (and some other fixes) @danjbh (#30)

what

• Update Github Actions
• Adding support for schedules and schedule_rotations to config module
• Updating config module README.md
• Adding support for multiple rules to config module escalations
• Resolves issue w/ team routing rules criteria
• Resolves issue w/ team member sorting (or lack thereof)
• Modifying for_each logic in config module to fix issue w/ mismatch between object schemas
• Removing unsupported resources from complete example (fixes terratest failure)

why

• We must have support for on-call schedules & rotations in the config module!