fix(core): update

ts/index.ts

@@ -1 +1,2 @@
 export * from './smartshell.classes.smartshell';
+export { which } from './smartshell.plugins';

ts/smartshell.plugins.ts

@@ -1,7 +1,7 @@
 import * as smartdelay from '@pushrocks/smartdelay';
 import * as smartexit from '@pushrocks/smartexit';
 import * as smartpromise from '@pushrocks/smartpromise';
-import * as which from 'which';
+import which from 'which';
 
 export { smartdelay, smartexit, smartpromise, which };