update version to v2.0.0

[johnfercher]

Description

• Update version to v2.0.0

Related Issue

Checklist

check with "x", ONLY IF APPLIED to your change

• All methods associated with structs has func (<first letter of struct> *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Followed the unit test when,should naming pattern.
• All mocks created with m := mocks.NewConstructor(t).
• All mocks using m.EXPECT().MethodName() method to mock methods.
• Updated docs/doc.go and docs/*
• Updated example_test.go
• Updated README.md
• Executed make examples to update all examples inside docs/examples.
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.12%. Comparing base (727147b) to head (8fc18f2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #418   +/-   ##
=======================================
  Coverage   82.12%   82.12%           
=======================================
  Files          61       61           
  Lines        2063     2063           
=======================================
  Hits         1694     1694           
  Misses        341      341           
  Partials       28       28           

Flag	Coverage Δ
unittests	82.12% <ø> (ø)

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