add Path.isRelative

[robstoll]

Platform (all, jvm, js, android): all
Extension (none, kotlin 1.3): none

Code related feature

expect(path).isRelative()

//instead of

expect(path).feature("isRelative") { isRelative() }

Following the things you need to do:

logic

• extend PathAssertions with a function isRelative (see other is... functions in PathAssertions as a guideline)
• implement isRelative in DefaultPathAssertions.kt

api-fluent

• add isRelative to pathAssertions.kt
• add @since 0.14.0 (adapt to current milestone) to KDOC
• add isRelative to Path(Feature)AssertionsSpec in specs-common

api-infix

• same same but different (see existing toBe ... functions)

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[jakubriegel]

I'll work on this #hactoberfest