docs: update README with the correct MSRV

Signed-off-by: Ali Sajid Imami <395482+AliSajid@users.noreply.github.com>

README.md

@@ -20,7 +20,7 @@ Generate a BOFH Excuse for github from the commandline as a `gh` extension.
 
 ## Builds
 
-|         | Stable | Beta | Nightly | MSRV (1.75.0) |
+|         | Stable | Beta | Nightly | MSRV (1.70.0) |
 | ------- | ------ | ---- | ------- | ---- |
 | Linux   | ![Ubuntu x Stable Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/ubuntu-stable.json) | ![Ubuntu x Beta Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/ubuntu-beta.json) | ![Ubuntu x Nightly Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/ubuntu-nightly.json) | ![Ubuntu x MSRV Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/ubuntu-msrv.json) |
 | Windows | ![Windows x Stable Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/windows-stable.json) | ![Windows x Beta Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/windows-beta.json) | ![Windows x Nightly Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/windows-nightly.json) | ![Windows x MSRV Rust](https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/AliSajid/68f75dde24f65f2a9333a4ca3d38c82b/raw/windows-msrv.json) |