When 1.7.0 is released, restore semver plugin config

[asfimport]

In order to rename everything for the 1.7.0 release, we had to turn off semver checking because it is an incompatible change. This is a reminder to turn it back on once 1.7.0 is released to validate changes going into 1.8.0.

Reporter: Ryan Blue / @rdblue
Assignee: Ryan Blue / @rdblue

PRs and other links:

• PR #200

_{Note: This issue was originally created as PARQUET-262. Please see the migration documentation for further details.}