chore: regenerate README (#372)

This PR was generated using Autosynth. 🌈


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

```
2021-01-07 22:21:36,585 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-video-intelligence/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-01-07 22:21:37,436 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/64289985-bdb5-4409-a404-db1edd5a814a/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-video-intelligence.git",
-        "sha": "605000f17ce3bf43b153551c727297fb42259f14"
+        "sha": "0bb513c1c1701be2f609b256f71a4a0894843fd2"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "a3e990f3545dc8ccd384a75d20ce9cb185ca6a28"
+        "sha": "67f09bf301083798e7220137723222eb00b8f88a"
       }
     }
   ]

README.md

@@ -42,7 +42,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-video-intelligence</artifactId>
-  <version>1.5.7</version>
+  <version>1.5.8</version>
 </dependency>
 <dependency>
   <groupId>com.google.cloud</groupId>
@@ -60,12 +60,12 @@ compile 'com.google.cloud:google-cloud-video-intelligence'
 ```
 If you are using Gradle without BOM, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-video-intelligence:1.5.7'
+compile 'com.google.cloud:google-cloud-video-intelligence:1.5.8'
 ```
 
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-video-intelligence" % "1.5.7"
+libraryDependencies += "com.google.cloud" % "google-cloud-video-intelligence" % "1.5.8"
 ```
 
 ## Authentication