update USAGE.md to reflect looser default version requirements

closes #84

Signed-off-by: Cody Cutrer <cody@cutrer.us>

USAGE.md

@@ -112,7 +112,7 @@ Additional [example rules are available](docs/examples.md), as well as examples
    Create a file called `jruby.cfg` in `<OPENHAB_CONF>/services/` with the following content:
 
    ```ini
-   org.openhab.automation.jrubyscripting:gems=openhab-scripting=~>5.0.0
+   org.openhab.automation.jrubyscripting:gems=openhab-scripting=~>5.0
    org.openhab.automation.jrubyscripting:require=openhab/dsl
    ```
 
@@ -129,7 +129,7 @@ Simply change the `gems` and `require` configuration settings.
 | Parameter             | Description                                                                                                |
 | --------------------- | ---------------------------------------------------------------------------------------------------------- |
 | `gem_home`            | The path to store Ruby Gems. <br/><br/>Default: `$OPENHAB_CONF/automation/ruby/.gem/{RUBY_ENGINE_VERSION}` |
-| `gems`                | A list of gems to install. <br/><br/>Default: `openhab-scripting=~>5.0.0`                                  |
+| `gems`                | A list of gems to install. <br/><br/>Default: `openhab-scripting=~>5.0`                                    |
 | `check_update`        | Check for updated version of `gems` on start up or settings change. <br/><br/>Default: `true`              |
 | `require`             | List of scripts to be required automatically. <br/><br/>Default: `openhab/dsl`                             |
 | `rubylib`             | Search path for user libraries. <br/><br/>Default: `$OPENHAB_CONF/automation/ruby/lib`                     |