Add information about test builds

.github/workflows/docs.yml

@@ -56,4 +56,4 @@ jobs:
           FTP_PASSWORD: ${{ secrets.DOCS_FTP_PASSWORD }}
           LOCAL_DIR: site
           REMOTE_DIR: public
-          ARGS: --delete --parallel=10
+          ARGS: --delete --parallel=20

docs/install.md

@@ -1,19 +1,30 @@
 # Installation Guide
 
-## Using PIP
+## Stable
+### Using PIP
 ```bash
 pip install -U aiogram
 ```
 
-## Using Pipenv
+### Using Pipenv
 ```bash
 pipenv install aiogram
 ```
 
-## Using poetry
+### Using poetry
 ```bash
 poetry add aiogram
 ```
 
-## Using AUR
+### Using AUR
 *aiogram* is also available in Arch User Repository, so you can install this library on any Arch-based distribution like ArchLinux, Antergos, Manjaro, etc. To do this, use your favorite AUR-helper and install [python-aiogram](https://aur.archlinux.org/packages/python-aiogram/) package.
+
+
+## Development build
+
+### From private PyPi index
+On every push to the `dev-3.x` branch GitHub Actions build the package and publish to the [2038.host](https://aiogram.2038.io/simple) server with seems like official PyPi files structure. That's mean you can always install latest (may be unstable) build via next command: 
+```bash
+pip install --extra-index-url https://aiogram.2038.io/simple --pre aiogram
+```
+In this repository available only last release. All previous builds is always removes before uploading new one. Also before building this package all tests is also pass.