chore: regenerate README (#488)

This PR was generated using Autosynth. 🌈


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

```
2021-07-02 20:23:13,750 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-websecurityscanner/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-07-02 20:23:14,996 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/082a1634-4703-4bd2-b32e-9d3caa15a26d/targets

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-websecurityscanner.git",
-        "sha": "a742069f069ba2e1bda64e9338594fb9dca0ba69"
+        "sha": "c2e17194ab3a7eac37822b746fb37bf73c0d4532"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "9763f20e4b7bb1091082462b2f7970e965d0d414"
+        "sha": "39652e3948f455fd0b77535a0145eeec561a3706"
       }
     }
   ]

README.md

@@ -38,7 +38,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-websecurityscanner</artifactId>
-  <version>1.2.1</version>
+  <version>1.2.2</version>
 </dependency>
 
 ```
@@ -51,12 +51,12 @@ compile 'com.google.cloud:google-cloud-websecurityscanner'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-websecurityscanner:1.2.1'
+compile 'com.google.cloud:google-cloud-websecurityscanner:1.2.2'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-websecurityscanner" % "1.2.1"
+libraryDependencies += "com.google.cloud" % "google-cloud-websecurityscanner" % "1.2.2"
 ```
 
 ## Authentication