Updated documentation to match webpack v2 changes.

[jagzviruz]

Updated docuentation.

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Does this PR introduce a breaking change?

• Yes
• No

[codecov]

Codecov Report

Merging #438 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #438   +/-   ##
=======================================
  Coverage   84.18%   84.18%           
=======================================
  Files           6        6           
  Lines         177      177           
  Branches       41       41           
=======================================
  Hits          149      149           
  Misses         12       12           
  Partials       16       16

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[Couto]

Thanks a lot for your contribution :)