[README] Add explicit "proceed to all platforms" below.
@@ -73,6 +73,8 @@ export CPPFLAGS="-I/usr/local/opt/zlib/include"
export PKG_CONFIG_PATH="/usr/local/opt/zlib/lib/pkgconfig"
```
+Now proceed to [All platforms](#all-platforms) below.
+
#### Linux <!-- omit in toc -->
On debian-based linux systems, install the required toolchain using:
