Update README.md to reflect version changes

[candu]

These instructions are outdated as of the 2.0.0 release, published to npm a couple of hours before this pull request was submitted.

Without these changes, following the directions for installation alongside webpack 1 results in an "unmet peer dependency" error.

[jsf-clabot]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #432 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #432   +/-   ##
=======================================
  Coverage   90.25%   90.25%           
=======================================
  Files           6        6           
  Lines         359      359           
  Branches       76       76           
=======================================
  Hits          324      324           
  Misses         35       35

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5268d14...290bb91. Read the comment docs.

[joshwiens]

Thanks @candu - Please sign the CLA and i'll get this merged.

[candu]

Just signed it, though it isn't showing up on the automatic check dashboard above.

[joshwiens]

Usually a sign of your local git config email not matching that which resides in your github account.

[candu]

I tried revoking CLA access, adding the email address in question to my github account, setting it as my primary, and re-signing. No dice; it insists on auto-filling my old email address.

Is there an easier way to remedy this? I'm happy to sign the CLA, but it isn't making this easy for me, and I don't have loads of time in the middle of a workday to debug further.