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Update release notes and language extensions for GHC 8.6.1. * Add `BlockArguments` and `NumericUndescores` in release note * Fix directive for `HexFloatLiterals` and `NumericUndescores` Test Plan: build Reviewers: bgamari Reviewed By: bgamari Subscribers: thomie, carter Differential Revision: https://phabricator.haskell.org/D4579
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