bump version to 0.2.8 (#1349)

* bump version to 0.2.8

* make import easier

* redis

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
           python -m pip install --upgrade pip wheel
           pip install -e .
           python -c "import autogen"
-          pip install -e. pytest mock
+          pip install pytest mock
       - name: Set AUTOGEN_USE_DOCKER based on OS
         shell: bash
         run: |
@@ -53,8 +53,7 @@ jobs:
       - name: Coverage
         if: matrix.python-version == '3.10'
         run: |
-          pip install -e .[test]
-          pip install -e .[redis]
+          pip install -e .[test,redis]
           coverage run -a -m pytest test --ignore=test/agentchat/contrib --skip-openai
           coverage xml
       - name: Upload coverage to Codecov