[spec-reviews] Remove 'signal upgrade' section in upgrade-insecure review (#58)

Addresses @mnot's comments in #54 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3ctag/spec-reviews/pull/58

-- Commit Summary --

  * Remove 'signal upgrade' section in upgrade-insecure review

-- File Changes --

    M 2015/04/Upgrade_Insecure.md (26)

-- Patch Links --

https://github.com/w3ctag/spec-reviews/pull/58.patch
https://github.com/w3ctag/spec-reviews/pull/58.diff

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https://github.com/w3ctag/spec-reviews/pull/58