Update Readme to the latest pymilvus version (#1233)

Signed-off-by: yangxuan <[email protected]>

Signed-off-by: yangxuan <[email protected]>

README.md

@@ -17,10 +17,11 @@ The following collection shows Milvus versions and recommended PyMilvus versions
 
 |Milvus version| Recommended PyMilvus version |
 |:-----:|:-----:|
-| 1.0.* | 1.0.1 |
-| 1.1.* | 1.1.2 |
-| 2.0.* | 2.0.2 |
-| 2.1.* | 2.1.1 |
+| 1.0.\* | 1.0.1 |
+| 1.1.\* | 1.1.2 |
+| 2.0.\* | 2.0.2 |
+| 2.1.\* | 2.1.3 |
+| 2.2.\* | 2.2.0 |
 
 
 ## Installation
@@ -34,7 +35,7 @@ $ pip3 install pymilvus
 You can install a specific version of PyMilvus by:
 
 ```shell
-$ pip3 install pymilvus==2.1.0
+$ pip3 install pymilvus==2.2.0
 ```
 
 You can upgrade PyMilvus to the latest version by:
@@ -71,7 +72,7 @@ $ python setup.py install
 
 ## Documentation
 
-Documentation is available online: https://milvus.io/api-reference/pymilvus/v2.1.1/About.md
+Documentation is available online: https://milvus.io/api-reference/pymilvus/v2.2.0/About.md
 
 ## Developing package releases