Update Node version compatibility info

Author: recrsn

README.md

@@ -22,9 +22,9 @@ If you are on a stable version of node, please provide a sufficient code snippet
 | 0.6, 0.8, 0.10 | >= 0.5            |
 | 0.11           | >= 0.8            |
 | 4              | <= 2.1.0          |
-| 8              | >= 1.0.3 < 4.0.0 |
+| 8              | >= 1.0.3 < 4.0.0  |
 | 10, 11         | >= 3              |
-| 12             | >= 3.0.6          |
+| 12 onwards     | >= 3.0.6          |
 
 `node-gyp` only works with stable/released versions of node. Since the `bcrypt` module uses `node-gyp` to build and install, you'll need a stable version of node to use bcrypt. If you do not, you'll likely see an error that starts with: