Removes duplicates from global history. Shows 'when'.

[tig]

Fixes #10
Fixes #5

+semver: minor

[github-actions]

PSScriptAnalyzer results:

Errors: [0], Warnings: [1], Information: [1]

RuleName   : PSPossibleIncorrectComparisonWithNull
Severity   : Warning
ScriptName : F7History.psm1
Line       : 25
Message    : $null should be on the left side of equality comparisons.

RuleName   : PSAvoidTrailingWhitespace
Severity   : Information
ScriptName : F7History.psm1
Line       : 24
Message    : Line has trailing whitespace

[github-actions]

PSScriptAnalyzer results:

Errors: [0], Warnings: [1], Information: [1]

RuleName   : PSPossibleIncorrectComparisonWithNull
Severity   : Warning
ScriptName : F7History.psm1
Line       : 26
Message    : $null should be on the left side of equality comparisons.

RuleName   : PSAvoidTrailingWhitespace
Severity   : Information
ScriptName : F7History.psm1
Line       : 25
Message    : Line has trailing whitespace

[github-actions]

PSScriptAnalyzer results:

Errors: [0], Warnings: [0], Information: [1]

RuleName   : PSAvoidTrailingWhitespace
Severity   : Information
ScriptName : F7History.psm1
Line       : 12
Message    : Line has trailing whitespace

[github-actions]

PSScriptAnalyzer results:

Errors: [0], Warnings: [1], Information: [0]

RuleName   : PSUseCmdletCorrectly
Severity   : Warning
ScriptName : F7History.psm1
Line       : 36
Message    : Cmdlet 'Write-Progress' may be used incorrectly. Please check that 
             all mandatory parameters are supplied.

[github-actions]

PSScriptAnalyzer results:

Errors: [0], Warnings: [1], Information: [0]

RuleName   : PSUseCmdletCorrectly
Severity   : Warning
ScriptName : F7History.psm1
Line       : 36
Message    : Cmdlet 'Write-Progress' may be used incorrectly. Please check that 
             all mandatory parameters are supplied.