chore: regenerate README (googleapis#433)

This PR was generated using Autosynth. 🌈


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

```
2021-04-12 14:30:35,148 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-resourcemanager/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-12 14:30:36,351 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/2d5fda5b-d5c8-488c-989a-952606f4a00e/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": "852dba40462bc1bd90c864931a8d196f5d558776"
+        "sha": "a0b0b24ccdb3573e8ec4328f15589e5814d42dc6"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "1f5e6bc8dc8e3661ee550905fc070e55e1b6cea1"
+        "sha": "0a071b3460344886297a304253bf924aa68ddb7e"
       }
     }
   ]

java-resourcemanager/README.md

@@ -8,12 +8,9 @@ Java idiomatic client for [Resource Manager API][product-docs].
 - [Product Documentation][product-docs]
 - [Client Library Documentation][javadocs]
 
-
 > Note: This client is a work-in-progress, and may occasionally
 > make backwards-incompatible changes.
 
-
-
 ## Quickstart
 
 If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
@@ -51,7 +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:19.2.1')
+implementation platform('com.google.cloud:libraries-bom:20.0.0')
 
 compile 'com.google.cloud:google-cloud-resourcemanager'
 ```