chore: regenerate README (#215)

This PR was generated using Autosynth. 🌈


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

```
2021-05-25 16:45:55,605 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-functions/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-05-25 16:45:56,805 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/b0a9bc08-a1d3-4874-bff3-1b1a41c616c9/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-functions.git",
-        "sha": "e99952e303196d8b584a472f58ecbd78c91df67d"
+        "sha": "e37c76aecb05508f47e2dcbda930d272f8ff37c7"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "4f4b1b9b8d8b52f1e9e4a76165896debce5ab7f1"
+        "sha": "a2de127f90799cd5bace653b1dcc5dd2ca8b19c9"
       }
     }
   ]

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>1.1.2</version>
+  <version>1.1.3</version>
 </dependency>
 
 ```