Update CHANGELOG

CHANGELOG.md

@@ -8,6 +8,8 @@ BUG FIXES:
 
   - core: Provider plugins more easily are compatible with global-status
       and should show less stale data. [GH-3808]
+  - core: When setting a synced folder, it will assume it is not disabled
+      unless explicitly specified. [GH-3783]
   - commands/package: Package with `--base` for VirtualBox doesn't
       crash. [GH-3827]
   - providers/docker: Never do graceful shutdown, always use

plugins/kernel_v2/config/vm.rb

@@ -186,7 +186,7 @@ module VagrantPlugins
         options ||= {}
         options[:guestpath] = guestpath.to_s.gsub(/\/$/, '')
         options[:hostpath]  = hostpath
-        options[:disabled]  = options[:disabled] || false
+        options[:disabled]  = false if !options.has_key?(:disabled)
         options = (@__synced_folders[options[:guestpath]] || {}).
           merge(options.dup)