chore: regenerate README (#193)

This PR was generated using Autosynth. 🌈


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

```
2020-10-20 23:37:11,437 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigqueryconnection/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-20 23:37:12,340 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/f27a77dc-d5bf-42ee-a068-21387b88fea7/targets

- [ ] To automatically regenerate this PR, check this box.

Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigqueryconnection.git",
-        "sha": "9594913e18cd4adacaee878b6986e3e2018e6720"
+        "sha": "ac3669dd00e1a3e13a7a00c26d94d064e44a5aa6"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "5a506ec8765cc04f7e29f888b8e9b257d9a7ae11"
+        "sha": "6abb59097be84599a1d6091fe534a49e5c5cf948"
       }
     }
   ]

README.md

@@ -20,7 +20,7 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigqueryconnection</artifactId>
-  <version>0.4.0</version>
+  <version>0.4.1</version>
 </dependency>
 
 ```