Fix version in osx_tools.app

misc/dist/osx_tools.app/Contents/Info.plist

@@ -19,11 +19,11 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.0</string>
+	<string>3.1</string>
 	<key>CFBundleSignature</key>
 	<string>godot</string>
 	<key>CFBundleVersion</key>
-	<string>3.0</string>
+	<string>3.1</string>
 	<key>NSHumanReadableCopyright</key>
 	<string>© 2007-2019 Juan Linietsky, Ariel Manzur &amp; Godot Engine contributors</string>
 	<key>LSMinimumSystemVersion</key>