Remove the hack & warning since the mockk pr has been approved (#11)

Our mockk PR was approved and is included in v1.13.7. This PR upgrades
which version of mockK we use and removes our hack (and warnings about
it)

---------

Co-authored-by: Geoff Hackett <geoff.hackett@reddit.com>

Author: ghackett

docs/README.md

@@ -2,12 +2,6 @@ Get your default answers back!
 
 [![Maven Central](https://img.shields.io/maven-central/v/com.episode6.reflectivemockk/reflective-mockk.svg?style=flat-square)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.episode6.reflectivemockk2%22)
 
-**WARNING:** This library is currently powered by a
-reflective ["hack"](https://github.com/episode6/reflective-mockk/blob/main/src/commonMain/kotlin/com/episode6/reflectivemockk/TheHack.kt)
-on mockK, and is thereby subject to removal/breakage by the mockK
-team at any time. If you enjoy this library & want it to be officially supported, post a comment saying so
-on [this PR: https://github.com/mockk/mockk/pull/1005](https://github.com/mockk/mockk/pull/1005).
-
 ### Installation
 
 ```groovy

libs.versions.toml

@@ -2,7 +2,7 @@
 assertk = "0.25"
 gradle = "7.5.1"
 kotlin = "1.7.10"
-mockk = "1.13.3"
+mockk = "1.13.7"
 kotlinx-coroutines = "1.6.4"
 
 [libraries]