🧹 refactor(tests): update dependency groups and installation commands

- Renamed `dev` group to `tests` for clarity.
- Updated installation commands in README and GitHub Actions.
- Ensures dependencies are installed for testing.

.github/workflows/python_test.yml

@@ -26,7 +26,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          pdm install --dev --no-lock -G mermaid
+          pdm install --no-lock -G mermaid tests
       - name: Run Tests
         env:
           TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}

README.md

@@ -30,12 +30,15 @@ To install the library, run:
 
 ```bash
 pip install telegramify-markdown
+pip install telegramify-markdown[mermaid]
 ```
 
 or, if you use `pdm`:
 
 ```shell
 pdm add telegramify-markdown
+pdm add telegramify-markdown -G mermaid
+# -G -> https://pdm-project.org/en/latest/reference/pep621/#optional-dependencies
 ```
 
 ### 🤔 What you want to do?

pyproject.toml

@@ -18,11 +18,11 @@ mermaid = [
     "Pillow>=10.4.0",
     "aiohttp>=3.10.11",
 ]
-
-[dependency-groups]
-dev = [
+tests = [
+    'pytest < 6',
     "pytelegrambotapi>=4.22.0",
     "python-dotenv>=1.0.1",
+    'mock >= 1.0.1, < 4; python_version < "3.4"',
 ]
 
 [project.urls]