优化 Markdown 文件打开方式注册

Note/Info.plist

@@ -15,13 +15,15 @@
 			<key>CFBundleTypeName</key>
 			<string>Markdown File</string>
 			<key>CFBundleTypeRole</key>
-			<string>Viewer</string>
+			<string>Editor</string>
 			<key>LSHandlerRank</key>
 			<string>Alternate</string>
 			<key>LSItemContentTypes</key>
 			<array>
 				<string>net.daringfireball.markdown</string>
+				<string>public.text</string>
 				<string>public.plain-text</string>
+				<string>public.utf8-plain-text</string>
 				<string>public.data</string>
 			</array>
 			<key>CFBundleTypeExtensions</key>
@@ -33,12 +35,13 @@
 		</dict>
 	</array>
 	<key>LSSupportsOpeningDocumentsInPlace</key>
-	<false/>
+	<true/>
 	<key>UTImportedTypeDeclarations</key>
 	<array>
 		<dict>
 			<key>UTTypeConformsTo</key>
 			<array>
+				<string>public.text</string>
 				<string>public.plain-text</string>
 			</array>
 			<key>UTTypeDescription</key>