Update ${version} on Manual Install in order to avoid confusion

Moves away from using a fixed version number in the installation instructions to prevent issues with users copy-pasting an old version number.

README.md

@@ -52,10 +52,11 @@ or [download a compatible release version of the plugin JAR](https://github.com/
 1. Copy the plugin JAR file to the `extensions/plugins/` directory of your SonarQube instance
 2. Add `-javaagent:./extensions/plugins/sonarqube-community-branch-plugin-${version}.jar=web` to
    the `sonar.web.javaAdditionalOpts` property in your Sonarqube installation's `conf/sonar.properties` file,
-   e.g. `sonar.web.javaAdditionalOpts=-javaagent:./extensions/plugins/sonarqube-community-branch-plugin-1.8.0.jar=web`
+   e.g. `sonar.web.javaAdditionalOpts=-javaagent:./extensions/plugins/sonarqube-community-branch-plugin-${version}.jar=web`
+   where ${version} is the version of the plugin being worked with. e.g `1.8.0`
 3. Add `-javaagent:./extensions/plugins/sonarqube-community-branch-plugin-${version}.jar=ce` to
    the `sonar.ce.javaAdditionalOpts` property in your Sonarqube installation's `conf/sonar.properties` file,
-   e.g. `sonar.ce.javaAdditionalOpts=-javaagent:./extensions/plugins/sonarqube-community-branch-plugin-1.8.0.jar=ce`
+   e.g. `sonar.ce.javaAdditionalOpts=-javaagent:./extensions/plugins/sonarqube-community-branch-plugin-${version}.jar=ce`
 4. Start Sonarqube, and accept the warning about using third-party plugins
 
 ## Docker