Merge pull request #577 from FederatedAI/feature-2.2.0-update-req

update version of fate_flow

Author: zhihuiwan

python/fate_flow/_info.py

@@ -12,5 +12,5 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-__version__ = "2.1.0"
+__version__ = "2.2.0"
 __provider__ = "fate_flow"