chore: update readme (#505)

autosynth cannot find the source of changes triggered by earlier changes in this repository, or by version upgrades to tools such as linters.

Author: yoshi-automation

README.md

@@ -38,7 +38,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-bigquerystorage</artifactId>
- <version>1.4.1</version>
+ <version>1.5.0</version>
 </dependency>
 
 ```

synth.metadata

@@ -11,7 +11,7 @@
  "git": {
  "name": ".",
  "remote": "https://github.com/googleapis/java-bigquerystorage.git",
- "sha": "ca7e19cc47824e1b16fe32df2c131d74f0b4de05"
+ "sha": "a80efdd49440a1774da54faba868282ba386f27d"
  }
  },
  {