chore: regenerate README (#200)

This PR was generated using Autosynth. 🌈


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

```
2021-03-04 20:05:06,267 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-aiplatform/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 20:05:07,452 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/72bcc6ea-c7db-41d8-b00e-bfa5c4e44d1d/targets

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

Author: yoshi-automation

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-aiplatform.git",
-        "sha": "aef7867c4edccaea0b59270e6ec3a3cfa2c9eccd"
+        "sha": "beaa1f046abb15de9b1979314aa0f2910af6e311"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "2e7bd5cc66a3f0b90ce1c150eb35c89eeb9872d6"
+        "sha": "d0bdade9a962042dc0f770cf631086f3db59b5b0"
       }
     }
   ]

README.md

@@ -37,7 +37,7 @@ 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-aiplatform'
 ```