[docgen] Update doc/neogen.txt

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doc/neogen.txt

@@ -183,12 +183,14 @@ Feel free to submit a PR, I will be happy to help you !
 We use semantic versioning ! (https://semver.org)
 Here is the current Neogen version:
 >
-  neogen.version = "2.8.1"
+  neogen.version = "2.9.0"
 <
 # Changelog~
 
 Note: We will only document `major` and `minor` versions, not `patch` ones. (only X and Y in X.Y.z)
 
+## 2.9.0~
+  - Add support for `vsnip` snippet engine ! (see |neogen-snippet-integration|)
 ## 2.8.0~
   - Specify annotation convention on `generate()` method (see |neogen.generate()|)
 ## 2.7.0~
@@ -243,6 +245,7 @@ To use a snippet engine, pass the option into neogen setup:
 Some snippet engines come out of the box bundled with neogen:
 - `"luasnip"` (https://github.com/L3MON4D3/LuaSnip)
 - `"snippy"` (https://github.com/dcampos/nvim-snippy)
+- `"vsnip"` (https://github.com/hrsh7th/vim-vsnip)
 
 If you want to customize the placeholders, you can use `placeholders_text` option:
 >