Add new optional rule: force `Expect` with `To`

[nunnatsa]

Description

Added new rule: should not use Expect with the Should or ShouldNot assertion methods.

This rule is not enabled by default. To enable it, use the --force-expect-to=true flag.

The new rule does support auto fix.

Fixes #112

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

• [x] Added test case and related test data
• [x] Update the functional test

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I ran golangci-lint

@nunnatsa

[coveralls]

Pull Request Test Coverage Report for Build 7868443728

Details

• -5 of 38 (86.84%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 84.953%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
gomegahandler/handler.go	3	5	60.0%
ginkgo_linter.go	29	32	90.63%
<!--	Total:	33	38	86.84%	-->

Files with Coverage Reduction	New Missed Lines	%
ginkgo_linter.go	1	90.3%
<!--	Total:	1		-->

Totals
Change from base Build 7862857433:	-0.1%
Covered Lines:	1163
Relevant Lines:	1369

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💛 - Coveralls