feat: bump version to 0.3.1 and set default titleFormat in gemtext config

package.json

@@ -1,7 +1,7 @@
 {
     "name": "astro-gemtext",
     "homepage": "https://github.com/aspizu/astro-gemtext",
-    "version": "0.3.0",
+    "version": "0.3.1",
     "type": "module",
     "main": "dist/index.js",
     "types": "dist/index.d.ts",

src/index.ts

@@ -24,6 +24,9 @@ type SetupHookParams = HookParameters<"astro:config:setup"> & {
 }
 
 export default function gemtext(config: GemtextConfig = {}): AstroIntegration {
+    if (!config.titleFormat) {
+        config.titleFormat = "first-heading"
+    }
     return {
         name: "astro-gemtext",
         hooks: {