Updated grammar updater, wrote a README, added Swift grammar, updated Kotlin grammar to v0.3.1

.gitignore

@@ -1 +1,58 @@
-.idea
+.idea
+
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+# Edit at https://www.toptal.com/developers/gitignore?templates=visualstudiocode,macos
+
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+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
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+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
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+# End of https://www.toptal.com/developers/gitignore/api/visualstudiocode,macos

_automation/README.md

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+# Grammar Version Checker
+
+This Go program automates the process of checking and updating grammar versions for various programming languages. It targets specific grammars defined in a JSON configuration file and supports operations like checking for updates and performing updates.
+
+If a grammar repository includes a Release, this updater prioritizes updating to the latest release rather than the most recent commit. In cases where the repository lacks releases, it defaults to using the latest commit. 
+
+## Features
+
+- **Check for Updates**: Scan through defined grammars and check if there are new versions available.
+- **Update Grammar**: Update a specific grammar to its latest version.
+- **Update All**: Batch update all grammars to their latest versions.
+- **Run Tests**: Run binding_test.go defined by every grammar
+
+## Prerequisites
+
+- Go installed on your machine.
+- Git installed and accessible from your command line.
+
+## Configuration
+
+The program relies on a JSON file (`_automation/grammars.json`) for the list of grammars to manage. Each grammar should specify its `language`, `url`, `files`, `reference` (tag or branch), and `revision` (commit hash).
+
+Example structure of `grammars.json`:
+
+```json
+[
+  {
+    "language": "golang",
+    "url": "https://github.com/tree-sitter/tree-sitter-go",
+    "files": [
+      "parser.c"
+    ],
+    "reference": "master",
+    "revision": "64457ea6b73ef5422ed1687178d4545c3e91334a"
+  }
+]
+```
+## Usage 
+
+### To Check for Updates
+
+```bash
+go run ./_automation/main.go check-updates
+```
+
+### To update a specific grammar
+```bash
+go run ./_automation/main.go update <language> [--force]
+```
+
+### To update all grammars
+```bash
+go run ./_automation/main.go update-all
+```
+
+## Test After Updating
+Once you've updated a grammar, it is important to test that the binding tests still pass (`binding_test.go`). This can be automated by running the following command, which will run `go test` against every grammar:
+
+```bash
+go run ./_automation/main.go run-tests
+```

_automation/grammars.json

@@ -143,8 +143,8 @@
       "parser.c",
       "scanner.c"
     ],
-    "reference": "main",
-    "revision": "cce9073807c6c1da81ce658d683fdac2878e5b57"
+    "reference": "0.3.1",
+    "revision": "be65fd695273434d91d1ca3829097b1211992a84"
   },
   {
     "language": "lua",
@@ -242,6 +242,16 @@
     "reference": "v0.10.1",
     "revision": "84c90ee15f851e1541c25c86e8a4338f5b4d5af2"
   },
+  {
+    "language": "swift",
+    "url": "https://github.com/alex-pinkus/tree-sitter-swift",
+    "files": [
+      "parser.c",
+      "scanner.c"
+    ],
+    "reference": "0.4.0",
+    "revision": "1c586339fb00014b23d6933f2cc32b588a226f3b"
+  },
   {
     "language": "toml",
     "url": "https://github.com/ikatyang/tree-sitter-toml",