chore: regenerate README (#212)

This PR was generated using Autosynth. 🌈


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

```
2020-10-29 15:04:30,740 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigqueryconnection/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-29 15:04:31,725 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/740844ed-5d62-4aca-8ba4-f36abaa45031/targets

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigqueryconnection.git",
-        "sha": "c25182dbca156bc26a4d966c03c8713feae09164"
+        "sha": "d61bb123ba452e14e87e9b38b0d09010bfc32542"
       }
     },
     {

README.md

@@ -17,7 +17,7 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigqueryconnection</artifactId>
-  <version>0.4.2</version>
+  <version>1.0.0</version>
 </dependency>
 
 ```