Update module hashicorp/go-version to v1

This MR contains the following updates:

Package	Type	Update	Change
github.com/hashicorp/go-version	require	major	v0.0.0-20180716215031-270f2f71b1ee -> v1.2.1

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Release Notes

hashicorp/go-version

v1.2.1

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Prevent Version.Equal method from panicking on nil encounter (#​73)

v1.2.0

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Add GreaterThanOrEqual + LessThanOrEqual helper methods.

v1.1.0

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Adds NewSemver constructor

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