chore: regenerate README (#307)

This PR was generated using Autosynth. 🌈


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

```
2020-12-02 18:28:43,481 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-storage-nio/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-02 18:28:44,342 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/605945a0-0efe-4261-a941-29d86ab01e98/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-storage-nio.git",
-        "sha": "2d0c406f12c37651374c5d51d4bd927110de5711"
+        "sha": "e88e3f0ba2b847edd52b271063184af2dbafae9b"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "7fcc405a579d5d53a726ff3da1b7c8c08f0f2d58"
+        "sha": "f94318521f63085b9ccb43d42af89f153fb39f15"
       }
     }
   ]

README.md

@@ -20,17 +20,17 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-nio</artifactId>
-  <version>0.122.1</version>
+  <version>0.122.2</version>
 </dependency>
 ```
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-nio:0.122.1'
+compile 'com.google.cloud:google-cloud-nio:0.122.2'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-nio" % "0.122.1"
+libraryDependencies += "com.google.cloud" % "google-cloud-nio" % "0.122.2"
 ```
 
 ## Authentication