chore: regenerate README (#105)

This PR was generated using Autosynth. 🌈


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

```
2020-12-14 19:59:55,161 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-functions/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-14 19:59:56,051 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/c6b270b1-19e5-44d2-b68c-2d4b2dd8419e/targets

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

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-functions.git",
-        "sha": "603e6e5c2fd5ab00474ad3d33b8bc6d23af7b17d"
+        "sha": "80170a344a82b50fa7c256b54b8273d49705d73d"
       }
     },
     {

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-functions</artifactId>
-  <version>1.0.2</version>
+  <version>1.0.3</version>
 </dependency>
 
 ```