chore: regenerate README (#999)

This PR was generated using Autosynth. 🌈


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

```
2021-08-23 23:02:31,357 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerydatatransfer/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-08-23 23:02:32,432 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/a3dec0b7-d8c7-4b9c-a890-46029dcb2f0c/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquerydatatransfer.git",
-        "sha": "fba4ddcc1fda2f20a7c6535862e93ba78077ff74"
+        "sha": "9a741cb6748c5eb0054d202d88f5c6273e034b51"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "484b7ec7bdef3909589a83e3d763e7588cb8c37c"
+        "sha": "8032ab5a32471d85ece8fc261df16cc40fbfa4fb"
       }
     }
   ]

README.md

@@ -56,13 +56,13 @@ compile 'com.google.cloud:google-cloud-bigquerydatatransfer'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-compile 'com.google.cloud:google-cloud-bigquerydatatransfer:2.0.4'
+compile 'com.google.cloud:google-cloud-bigquerydatatransfer:2.0.5'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquerydatatransfer" % "2.0.4"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquerydatatransfer" % "2.0.5"
 ```
 
 ## Authentication