chore: bump version 0.3.0 (tikv#434)

Signed-off-by: Andy Lok <andylokandy@hotmail.com>

Author: andylokandy

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tikv-client"
-version = "0.2.0"
+version = "0.3.0"
 keywords = ["TiKV", "KV", "distributed-systems"]
 license = "Apache-2.0"
 authors = ["The TiKV Project Authors"]

README.md

@@ -17,7 +17,7 @@ The TiKV client is a Rust library (crate). To use this crate in your project, ad
 
 ```toml
 [dependencies]
-tikv-client = "0.2.0"
+tikv-client = "0.3"
 ```
 
 ### Prerequisites