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FEATURES:
- Add `ProtocolVersion` to `ReattachConfig` struct, enabling provider protocol v6 support in reattach mode, provided that Terraform and the provider plugin are both using go-plugin v1.4.1 or later. This change is backwards-compatible, as zero values for this field are interpreted as protocol v5. [GH-182]
- Introduce `tfexec.Get()` for downloading modules [GH-176]
+ - Introduce `tfexec.Upgrade013()` [GH-178]
# 0.13.3 (April 23, 2021)
