Add nodemon dependency to installation instructions

Without this, you will get an error when running `npm run dev` after following the installation instructions.
Himujjal · Jul 4, 2022 · 922286f · 922286f
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diff --git a/README.md b/README.md
@@ -8,6 +8,12 @@ Tree-sitter grammar for [svelte](https://svelte.dev)
 npm i tree-sitter-svelte tree-sitter
 ```
 
+Tree-sitter also requires [nodemon](https://nodemon.io/) to run, so also install that if you don’t already have it:
+
+```
+npm i -g nodemon
+```
+
 # Dev
 
 After installation (`npm i`),