chore: regenerate README (googleapis#397)

This PR was generated using Autosynth. 🌈


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

```
2021-03-04 19:39:15,343 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-resourcemanager/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 19:39:16,284 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/5f809a70-f4a0-4457-8338-dfe283a48e40/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": "7577057dd56d5e2772953167e307124b0e148688"
+        "sha": "ff9f8195f06b87d257c5a552ac783cd5245e2369"
       }
     },
     {

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>18.0.0</version>
+      <version>19.0.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
@@ -48,7 +48,7 @@ If you are using Maven without BOM, add this to your dependencies:
 
 If you are using Gradle 5.x or later, add this to your dependencies
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:18.1.0')
+implementation platform('com.google.cloud:libraries-bom:19.0.0')
 
 compile 'com.google.cloud:google-cloud-resourcemanager'
 ```