Bump version to 3.0.1-stable

Thanks everyone for all your amazing work getting our first stable patch
release out for the 3.0 series. I'd particularly like to thank @fales
and @fire for their work on the server platform.

Onwards to 3.0.2!

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>3.0.1</string>
 	<key>CFBundleSignature</key>
 	<string>godot</string>
 	<key>CFBundleVersion</key>
-	<string>3.0</string>
+	<string>3.0.1</string>
 	<key>NSHumanReadableCopyright</key>
 	<string>© 2007-2018 Juan Linietsky, Ariel Manzur.</string>
 	<key>LSMinimumSystemVersion</key>

version.py

@@ -3,5 +3,5 @@ name = "Godot Engine"
 major = 3
 minor = 0
 patch = 1
-status = "devel"
+status = "stable"
 module_config = ""