Recommend that people use v2.0.0+ in the README

[theckman]

Anything less than v2.0.0 is known to have some deficiencies, so this updates the README to recommend consumers use 2.0.0+.

v2.0.0 needs to be released after merging this change.

Signed-off-by: Tim Heckman t@heckman.io

[theckman]

Pending any requested changes to this PR, or additional features, the tentative plan is to merge this PR in the morning (~8-10 hours from now) and cut the v2.0.0 release on the merge commit.

[coveralls]

Pull Request Test Coverage Report for Build 89

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.8%) to 98.214%

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Totals
Change from base Build 85:	-0.8%
Covered Lines:	165
Relevant Lines:	168

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💛 - Coveralls