Support both 4.0 and nightly builds

This release fixes new errors released in nightly builds

Update requirements to 4.0

v2.5.0-3 had incorrect HHVMK version requirements; v2.5.4 was a retag of v2.4.0 for users of HHVM 3.30, this provides a more recent version for users of HHVM 4.0

Support both 4.0 and nightly builds

This release supports both HHVM 4.0, and 2019.02.27

Allow ->toAlmostEqual with nullable nums

nulls vs non-nulls explicitly fail this assertion.

Support for current nightly builds, more type constraints

This release:

• supports hhvm 2019.02.14
• is entirely in strict mode; this has required adding type constraints. For example, expect($foo)->toBeGreaterThan($bar) now requires both $foo and $bar to be num

Retag v2.4.0 with higher version number

v2.5 has incorrrect version constraints - this release belongs as part of v2.4.x, but is being made so that users of 3.30 get a usable version. v2.5.5 will be released shortly for 4.0 users

Support HHVM 4

This release is identical to the previous release, however it has more liberal dependency constraints.

Support HHVM v4.0

Add support for type checking Container and KeyedContainer. (#8)

* Update IsType.php

* tests `KeyedContainer` and `Container` types

Throw `Facebook\HackTest\ExpectationFailedException` instead of `Facebook\FBExpect\ExpectationFailedException`

This restores the distinction between 'failed' and 'error' tests.

Support optional changes in HHVM 3.29

This release:

• supports typed user attributes
• disabled refinement of is_foo() functions