Updated README to point to Releases page

Author: billmurrin

README.md

@@ -21,7 +21,7 @@ Way Ahead (Next Version)
 
 Installation
 ------------
-[Download the plugin](https://www.dropbox.com/s/f1a1yupql1mxgm8/graylog-plugin-quickvaluesplus-widget-1.0.0.jar?dl=0)
+[Download the plugin](https://github.com/billmurrin/graylog-plugin-quickvaluesplus-widget/releases/)
 and place the `.jar` file in your Graylog plugin directory. The plugin directory
 is the `plugins/` folder relative from your `graylog-server` directory by default
 and can be configured in your `graylog.conf` file.
@@ -94,4 +94,4 @@ $ mvn release:prepare
 $ mvn release:perform
 ```
 
-This sets the version numbers, creates a tag and pushes to GitHub. Travis CI will build the release artifacts and upload to GitHub automatically.
+This sets the version numbers, creates a tag and pushes to GitHub. Travis CI will build the release artifacts and upload to GitHub automatically.