fix: rephrase error message + bump to 1.2.10

packages/osc/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@strudel/osc",
-  "version": "1.2.9",
+  "version": "1.2.10",
   "description": "OSC messaging for strudel",
   "main": "osc.mjs",
   "bin": "./server.js",

packages/osc/server.js

@@ -56,7 +56,7 @@ if (debug) {
 osc.on('error', (message) => {
   if (message.toString().includes('EADDRINUSE')) {
     console.log(`------ ERROR -------
-osc server already running! to stop it:
+a server is already running on port 57121! to stop it:
 1. run "lsof -ti :57121 | xargs kill -9" (macos / linux)
 2. re-run the osc server
 `);