chore: regenerate README (#1280)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2021-09-01 17:00:40,270 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerystorage/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-09-01 17:00:43,197 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/968593e2-882b-4456-b0bc-b429972ee045/targets

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.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquerystorage.git",
-        "sha": "0ab4bbbb1203f0dda49be721df7e2cee3838ec0b"
+        "sha": "0b5ef38a2f23cfe48653fcbf725ffdb05df46c2f"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "e770c12f2a9a5f84566fe04b16a4ceec1c8c109b"
+        "sha": "5c0fa62eea9c33ebe61e582424b659eb264e1ba4"
       }
     }
   ]

README.md

@@ -41,7 +41,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigquerystorage</artifactId>
-  <version>2.1.0</version>
+  <version>2.1.1</version>
 </dependency>
 
 ```
@@ -56,13 +56,13 @@ implementation 'com.google.cloud:google-cloud-bigquerystorage'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-bigquerystorage:2.1.0'
+implementation 'com.google.cloud:google-cloud-bigquerystorage:2.1.1'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "2.1.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "2.1.1"
 ```
 
 ## Authentication