chore: regenerate README (#350)

This PR was generated using Autosynth. 🌈


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

```
2020-12-14 20:04:41,786 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-billingbudgets/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-14 20:04:42,624 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/b4bb3704-da76-4bd8-a694-ceb95b2a5733/targets

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-billingbudgets.git",
-        "sha": "83f765e898ba61fbe6a20aac929065ebd9e2aa76"
+        "sha": "dd117e805e27cf0b4d5013cb056e1f3ae13b7c7c"
       }
     },
     {

README.md

@@ -38,7 +38,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-billingbudgets</artifactId>
-  <version>1.0.0</version>
+  <version>1.0.1</version>
 </dependency>
 
 ```