fix(test-utils/wrapper): clarify deprecation note for wrong "get" usage (vuejs#1688)

If `wrapper.get` was called with a vue component instance, a misleading deprecation note was shown
to the user. This fix includes the `get` method into the deprecation message

fix vuejs#1687

Co-authored-by: Valentin Palkovič <[email protected]>

Author: valentinpalkovic

packages/test-utils/src/wrapper.js

@@ -224,7 +224,7 @@ export default class Wrapper implements BaseWrapper {
     const selector = getSelector(rawSelector, 'find')
     if (selector.type !== DOM_SELECTOR) {
       warnDeprecated(
-        'finding components with `find`',
+        'finding components with `find` or `get`',
         'Use `findComponent` instead'
       )
     }