docs: update README for 14.0.0

VerteDinde · VerteDinde · commit f438e5342d7c · 2021-03-10T11:14:43.000-08:00
diff --git a/README.md b/README.md
@@ -32,6 +32,7 @@ For given versions of Electron you must depend on a very specific version range
 | `^9.0.0` | `^11.0.0`|
 | `^10.0.0` | `^12.0.0`|
 | `^11.0.0` | `^13.0.0`|
+| `^12.0.0` | `^14.0.0`|
 
 Learn more from [this presentation](https://speakerdeck.com/kevinsawicki/testing-your-electron-apps-with-chromedriver).
 
