Update to 0.13.0, opportunistically claim Nu protocol compatability

Plugin breakage will only occur if the protocol changes, not on
harmless version bumps of Nu.

Fixes #25

README.md

@@ -20,19 +20,24 @@ Since Nushell 0.91.0 the plugin protocol was enhanced and now requires version c
 
 The following versions are compatible.
 
-| Nushell | bash-env plugin |
-| ------- | --------------- |
-|    0.89 |           0.5.0 |
-|    0.90 |           0.5.0 |
-|    0.91 |           0.6.2 |
-|    0.92 |           0.7.1 |
-|    0.93 |           0.8.0 |
-|    0.93 |           0.9.0 |
-|    0.94 |          0.10.0 |
-|    0.95 |          0.11.0 |
-|    0.96 |          0.12.1 |
-
-If you find a new version of Nushell rejects this plugin as incompatible, please report an [issue](https://github.com/tesujimath/nu_plugin_bash_env/issues).
+|  Nushell | bash-env plugin |
+| -------- | --------------- |
+|    0.89  |           0.5.0 |
+|    0.90  |           0.5.0 |
+|    0.91  |           0.6.2 |
+|    0.92  |           0.7.1 |
+|    0.93  |           0.8.0 |
+|    0.93  |           0.9.0 |
+|    0.94  |          0.10.0 |
+|    0.95  |          0.11.0 |
+|    0.96  |          0.12.1 |
+|    0.97+ |          0.13.0 |
+
+Since version 0.13, the plugin claims compatability with whatever version of Nu happens to be on the path.  This avoids having to keep version-bumping the plugin for each new release of Nu.
+
+The drawback is unexpected breakage may occur.
+
+If you find a new version of Nushell breaks the plugin, please report an [issue](https://github.com/tesujimath/nu_plugin_bash_env/issues).
 
 ## Dependencies
 

nu_plugin_bash_env

@@ -22,8 +22,8 @@
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-VERSION="0.12.1"
-PROTOCOL_VERSION="0.96.1"
+VERSION="0.13.0"
+PROTOCOL_VERSION="$(nu --version)"
 
 shopt -s extglob