chore(package): update peerDependencies (webpack v3.0.0)

[michael-ciniawsky]

What kind of change does this PR introduce?

• Chore

Does this PR introduce a breaking change?

• No

[michael-ciniawsky]

Fixes #932

[codecov]

Codecov Report

Merging #948 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #948   +/-   ##
=======================================
  Coverage   72.13%   72.13%           
=======================================
  Files           4        4           
  Lines         463      463           
  Branches      139      139           
=======================================
  Hits          334      334           
  Misses        129      129

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[lencioni]

Duplicate of #946

[michael-ciniawsky]

Yup Yup :) you were first aswell, @webpack/dev-server-team if the dependency bump is fine in #946 just close this one please