rename '--fetch/build-grammars' flags into '--grammar fetch/build'

The old flags were a bit long. --grammar is also aliased to -g to make
it even easier.

1 files changed, 2 insertions, 2 deletions

diff --git a/README.md b/README.md
index 8e4e42d9..4052d941 100644
--- a/README.md
+++ b/README.md
@@ -39,8 +39,8 @@ build from source.
 git clone https://github.com/helix-editor/helix
 cd helix
 cargo install --path helix-term
-hx --fetch-grammars
-hx --build-grammars
+hx --grammar fetch
+hx --grammar build
 ```
 
 This will install the `hx` binary to `$HOME/.cargo/bin` and build tree-sitter grammars.