Support the new methods in 1.4

[Nyholm]

I released 1.4.0 with some new assertions that should be added here.

• Assert::ip()
• Assert::ipv4()
• Assert::ipv6()
• Assert::notRegex()
• Assert::interfaceExists()
• Assert::isList()
• Assert::isMap()

[mavimo]

@Nyholm I'm planning to work on it the next week cc/ @ondrejmirtes

[ruudk]

Maybe good to change the title to Support the new methods between 1.4 and 1.7
https://github.com/webmozart/assert/blob/1.7.0/CHANGELOG.md#170-2020-02-14

[herndlm]

fyi @ondrejmirtes I went through methods in webmozart/assert and what we support here and saw that only the following don't further specify types:

type:

• Assert::uniqueValues() (in Revert non-empty-array specification for Assert::uniqueValues #178 we learned that we can't narrow array further unfortunately..)

string:

• Assert::notContains()
• Assert::notStartsWith()
• Assert::notEndsWith()
• Assert::regex()
• Assert::notRegex()

file:

• Assert::fileExists()
• Assert::file()
• Assert::directory()
• Assert::readable()
• Assert::writable()

object:

• Assert::propertyNotExists()
• Assert::methodNotExists()

function:

• Assert::throws()

I'm not sure if more is possible. Related to this issue the only one left is notRegex(), which checks that a string does not match a given regex. Not sure, but I don't think we can specify further types here, except doing something with constant strings maybe, but not sure if it's possible/worth.

IMO this issue can be closed, what do you think?