Bump for rc.3

Author: David Heinemeier Hansson

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    webpacker (6.0.0.rc.2)
+    webpacker (6.0.0.rc.3)
       activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
       railties (>= 5.2)

docs/v6_upgrade.md

@@ -26,15 +26,15 @@ Example going to a specific version:
 
   ```ruby
   # Gemfile
-  gem 'webpacker', '6.0.0.rc.2'
+  gem 'webpacker', '6.0.0.rc.3'
   ```
 
   ```bash
   bundle install
   ```
 
   ```bash
-  yarn add @rails/webpacker@6.0.0-rc.2 --exact
+  yarn add @rails/webpacker@6.0.0-rc.3 --exact
   ```
 
   ```bash

lib/webpacker/version.rb

@@ -1,4 +1,4 @@
 module Webpacker
   # Change the version in package.json too, please!
-  VERSION = "6.0.0.rc.2".freeze
+  VERSION = "6.0.0.rc.3".freeze
 end

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@rails/webpacker",
-  "version": "6.0.0-rc.2",
+  "version": "6.0.0-rc.3",
   "description": "Use webpack to manage app-like JavaScript modules in Rails",
   "main": "package/index.js",
   "files": [