chore: regenerate README (#359)

This PR was generated using Autosynth. 🌈


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

```
2021-02-10 17:02:33,799 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-phishingprotection/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-10 17:02:34,648 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/579eb26f-857f-4eb5-9dca-6d3d33bbd3fe/targets

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

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-phishingprotection.git",
-        "sha": "931bd7a954d198b6aa2fb235365372cf33bb46d5"
+        "sha": "a737a1bc37c0ce08a927d6fc681ea5ba9d91f0a1"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "a38d9dbf2fe5e0352b1dffd7eb15e31809c7fd62"
+        "sha": "2414b817065726eae0bc525346c7e874f969369d"
       }
     }
   ]

README.md

@@ -48,18 +48,18 @@ 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:16.3.0')
+implementation platform('com.google.cloud:libraries-bom:16.4.0')
 
 compile 'com.google.cloud:google-cloud-phishingprotection'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-phishingprotection:0.29.12'
+compile 'com.google.cloud:google-cloud-phishingprotection:0.29.13'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-phishingprotection" % "0.29.12"
+libraryDependencies += "com.google.cloud" % "google-cloud-phishingprotection" % "0.29.13"
 ```
 
 ## Authentication