chore: regenerate README (#469)

This PR was generated using Autosynth. 🌈


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

```
2021-06-02 20:14:50,963 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-websecurityscanner/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-06-02 20:14:52,198 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/be4c0ebd-3286-4a5d-a0ed-abfd3f0564ba/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-websecurityscanner.git",
-        "sha": "99f1640b0d0beab8edc8745b78c44382cd94a2ec"
+        "sha": "0ce7fa5bdcd335c9d019513171190cd5759c8fb3"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "a2de127f90799cd5bace653b1dcc5dd2ca8b19c9"
+        "sha": "c3e41da0fa256ad7f6b4bc76b9d069dedecdfef4"
       }
     }
   ]

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>1.1.6</version>
+  <version>1.2.0</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:1.1.6'
+compile 'com.google.cloud:google-cloud-websecurityscanner:1.2.0'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-websecurityscanner" % "1.1.6"
+libraryDependencies += "com.google.cloud" % "google-cloud-websecurityscanner" % "1.2.0"
 ```
 
 ## Authentication