Add core.info to Logging section

packages/core/README.md

@@ -89,6 +89,7 @@ try {
   }
 
   // Do stuff
+  core.info('Output to the actions build log')
 }
 catch (err) {
   core.error(`Error ${err}, action may still succeed though`);
@@ -143,4 +144,4 @@ const core = require('@actions/core');
 var pid = core.getState("pidToKill");
 
 process.kill(pid);
-```
+```