Update README for Vapor 3

Author: 0xTim

README.md

@@ -3,7 +3,7 @@
     <br>
     <br>
     <a href="https://swift.org">
-        <img src="http://img.shields.io/badge/Swift-4-brightgreen.svg" alt="Language">
+        <img src="http://img.shields.io/badge/Swift-4.1-brightgreen.svg" alt="Language">
     </a>
     <a href="https://travis-ci.org/brokenhandsio/VaporSecurityHeaders">
         <img src="https://travis-ci.org/brokenhandsio/VaporSecurityHeaders.svg?branch=master" alt="Build Status">
@@ -35,29 +35,21 @@ These headers will *help* prevent cross-site scripting attacks, SSL downgrade at
 
 # Usage
 
-To use Vapor Security Headers, just add the middleware to your `Config` and then to your `droplet.json`. Vapor Security Headers makes this easy to do with a `builder` function on the factory:
+To use Vapor Security Headers, just register the middleware with your services and add it to your `MiddlewareConfig`. Vapor Security Headers makes this easy to do with a `builder` function on the factory. In `configure.swift` add:
 
 ```swift
-let config = Config()
+services.register(securityHeadersToAdd.build())
 let securityHeadersFactory = SecurityHeadersFactory()
-config.addConfigurable(middleware: securityHeadersFactory.builder(), name: "security-headers"))
-let drop = Droplet(config)
+
+var middlewareConfig = MiddlewareConfig()
+middlewareConfig.use(SecurityHeaders.self)
+// ...
+services.register(middlewareConfig)
 ```
 
 The default factory will add default values to your site for Content-Security-Policy, X-XSS-Protection, X-Frame-Options and X-Content-Type-Options.
 
-***Note:*** You should ensure you set the security headers as the first middleware in your `droplet.json` to make sure the headers get added to all responses:
-
-```json
-{
-    ...
-    "middleware": [
-        "security-headers",
-        ...
-    ],
-    ...
-}
-```
+***Note:*** You should ensure you set the security headers as the first middleware in your `MiddlewareConfig` to make sure the headers get added to all responses
 
 If you want to add your own values, it is easy to do using the factory. For instance, to add a content security policy configuration, just do:
 
@@ -72,7 +64,7 @@ You will need to add it as a dependency in your `Package.swift` file:
 ```swift
 dependencies: [
     ...,
-    .package(url: "https://github.com/brokenhandsio/VaporSecurityHeaders.git", from: "1.1.0")
+    .package(url: "https://github.com/brokenhandsio/VaporSecurityHeaders.git", from: "2.0.0")
 ]
 ```
 
@@ -140,14 +132,22 @@ Check out [https://report-uri.io/](https://report-uri.io/) for a free tool to se
 
 ### Page Specific CSP
 
-Vapor Security Headers also supports setting the CSP on a route or request basis. If the middleware has been added to the Droplet, you can override the CSP for a request. This allows you to have a strict default CSP, but allow content from extra sources when required, such as only allowing the Javascript for blog comments on the blog page. Create a separate `ContentSecurityPolicyConfiguration` and then add it to the request. For example, inside a route handler, you could do:
+Vapor Security Headers also supports setting the CSP on a route or request basis. If the middleware has been added to the `MiddlewareConfig`, you can override the CSP for a request. This allows you to have a strict default CSP, but allow content from extra sources when required, such as only allowing the Javascript for blog comments on the blog page. Create a separate `ContentSecurityPolicyConfiguration` and then add it to the request. For example, inside a route handler, you could do:
 
 ```swift
 let pageSpecificCSPVaue = "default-src 'none'; script-src https://comments.disqus.com;"
 let pageSpecificCSP = ContentSecurityPolicyConfiguration(value: pageSpecificCSPValue)
 request.contentSecurityPolicy = pageSpecificCSP
 ```
 
+You must also enable the `CSPRequestConfiguration` service for this to work. In `configure.swift` add:
+
+```swift
+services.register { _ in
+    return CSPRequestConfiguration()
+}
+```
+
 ## Content-Security-Policy-Report-Only
 
 Content-Security-Policy-Report-Only works in exactly the same way as Content-Security-Policy except that any violations will not block content, but they will be reported back to you. This is extremely useful for testing a CSP before rolling it out over your site. You can run both side by side - so for example have a fairly simply policy under Content-Security-Policy but test a more restrictive policy over Content-Security-Policy-Report-Only. The great thing about this is that your users do all your testing for you!
@@ -175,7 +175,7 @@ To just enable the protection:
 let xssProtectionConfig = XssProtectionConfiguration(option: .enable)
 ```
 
-To sanitize the page and report the violation:
+To sanitise the page and report the violation:
 
 ```swift
 let xssProtectionConfig = XssProtectionConfiguration(option: .report("https://report-uri.com"))