chore: regenerate README (googleapis#315)

This PR was generated using Autosynth. 🌈


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

```
2020-11-18 18:58:12,143 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-resourcemanager/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-18 18:58:13,067 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/e2708334-f682-45ba-a6c8-69b4d82e5aba/targets

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

java-resourcemanager/.github/readme/synth.metadata/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-resourcemanager.git",
-        "sha": "be4d2ce26e990cf94c7e9c4f38e16db761fc6f43"
+        "sha": "0dd992705236efb59c1004bdfbe33ac17411ed71"
       }
     },
     {

java-resourcemanager/README.md

@@ -20,7 +20,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>15.1.0</version>
+      <version>16.0.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>