chore: regenerate README (#1220)

This PR was generated using Autosynth. 🌈


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

```
2021-04-08 21:37:40,916 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquery/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-08 21:37:42,272 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/a052e6a0-8dba-49f1-92b1-413fe6d757e3/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquery.git",
-        "sha": "32cdb8e0180de13adbc78743ed9e6ac50b254223"
+        "sha": "ae8375c9787cd3dd9b39af804c152466a0dabb83"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "60fc32cc950c20cfdd774b846a4a7dc5d1e4d0ef"
+        "sha": "0f3469e88a4be9af4d9b1c4b6cf6fd3f8ac15588"
       }
     }
   ]

README.md

@@ -40,7 +40,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigquery</artifactId>
-  <version>1.127.11</version>
+  <version>1.127.12</version>
 </dependency>
 
 ```
@@ -53,12 +53,12 @@ compile 'com.google.cloud:google-cloud-bigquery'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-bigquery:1.127.11'
+compile 'com.google.cloud:google-cloud-bigquery:1.127.12'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquery" % "1.127.11"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquery" % "1.127.12"
 ```
 
 ## Authentication