Bug 1563848 - Recommend a VSCode plugin for prettier. r=vporof

Differential Revision: https://phabricator.services.mozilla.com/D37134

--HG--
extra : moz-landing-system : lando

.vscode/extensions.json

@@ -1,18 +1,20 @@
 {
-    // See http://go.microsoft.com/fwlink/?LinkId=827846
-    // for the documentation about the extensions.json format
-    "recommendations": [
-        // Trim only touched lines.
-        "NathanRidley.autotrim",
-        // ESLint support.
-        "dbaeumer.vscode-eslint",
-        // C/C++ language support.
-        "ms-vscode.cpptools",
-        // Rust language support.
-        "rust-lang.rust",
-        // CSS support for HTML documents.
-        "ecmel.vscode-html-css",
-        // IDL language support
-        "mythmon.idl"
-    ]
+  // See http://go.microsoft.com/fwlink/?LinkId=827846
+  // for the documentation about the extensions.json format
+  "recommendations": [
+    // Trim only touched lines.
+    "NathanRidley.autotrim",
+    // ESLint support.
+    "dbaeumer.vscode-eslint",
+    // Prettier support.
+    "esbenp.prettier-vscode",
+    // C/C++ language support.
+    "ms-vscode.cpptools",
+    // Rust language support.
+    "rust-lang.rust",
+    // CSS support for HTML documents.
+    "ecmel.vscode-html-css",
+    // IDL language support
+    "mythmon.idl"
+  ]
 }