Minor
New matchers added:
- toEqualCaseInsensitive #45
- toStartWith #53
- toBeNegative #59
- toBeOneOf #61
- toContainKey #63
- toBeString #51
- toBeExtensible #62
- toBeWithin #68
- toIncludeMultiple #64
- toEndWith #76
Big thanks to: @btnwtn @GaryLeutheuser @lindgr3n @andrewhayward @olsio @tjwhalen16 @martiuslim @ecollis6 @marcinlichwala