chore: regenerate README (googleapis#413)

This PR was generated using Autosynth. 🌈


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

```
2021-03-23 15:44:48,242 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-resourcemanager/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-23 15:44:49,092 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/0cd87ed2-2ae5-4da7-92a2-fe2a14a0b351/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-resourcemanager.git",
-        "sha": "08cfba5b6c8d2c3487bd083404b810e62e2021d1"
+        "sha": "27cee9d683167eaf7a3027c40b19610c5e3a670b"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "78437c732a60c64895778697b078497b0988346c"
+        "sha": "c84c8f156e09702e1c8946bfb9746e6f5892cf27"
       }
     }
   ]

java-resourcemanager/README.md

@@ -41,14 +41,14 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-resourcemanager</artifactId>
-  <version>0.118.10-alpha</version>
+  <version>0.118.12-alpha</version>
 </dependency>
 
 ```
 
 If you are using Gradle 5.x or later, add this to your dependencies
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:19.1.0')
+implementation platform('com.google.cloud:libraries-bom:19.2.1')
 
 compile 'com.google.cloud:google-cloud-resourcemanager'
 ```