Release azure-cli-nspkg 3.0.0

[derekbekoe]

No description provided.

[azuresdkci]

Reviewers, please verify the following for this PR:

• The PR title has format Release <component-name> <version>.
• setup.py has been modified with the same version as in the PR title.
• HISTORY.rst has been modified with appropriate release notes.
• If releasing azure-cli or azure-cli-core, __version__ defined in __init__.py should also be modified to match.

[codecov-io]

Codecov Report

Merging #3078 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3078   +/-   ##
=======================================
  Coverage   70.72%   70.72%           
=======================================
  Files         357      357           
  Lines       22906    22906           
  Branches     3526     3526           
=======================================
  Hits        16201    16201           
  Misses       5610     5610           
  Partials     1095     1095

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[azuresdkci]

Started releasing azure-cli-nspkg 3.0.0...

[azuresdkci]

Release of 'azure-cli-nspkg' with version '3.0.0' successful. View at https://pypi.python.org/pypi/azure-cli-nspkg/3.0.0.

[azuresdkci]

GitHub release created. https://github.com/Azure/azure-cli/releases.