chore: regenerate README (#711)

This PR was generated using Autosynth. 🌈


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

```
2020-12-06 23:21:20,080 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerystorage/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-06 23:21:20,981 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/fcfddd04-d866-405c-a241-3fb56532bba6/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": "3a1b367239b8d9a9839322d677a94ba098eee69e"
+        "sha": "2f1c386a7744c1e134c20bc8d07cefb1eebd7e8b"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "f94318521f63085b9ccb43d42af89f153fb39f15"
+        "sha": "18c5dbdb4ac8cf75d4d8174e7b4558f48e76f8a1"
       }
     }
   ]

README.md

@@ -38,18 +38,18 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigquerystorage</artifactId>
-  <version>1.6.5</version>
+  <version>1.6.7</version>
 </dependency>
 
 ```
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-bigquerystorage:1.6.5'
+compile 'com.google.cloud:google-cloud-bigquerystorage:1.6.7'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "1.6.5"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "1.6.7"
 ```
 
 ## Authentication