update docs

LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2020, Aaron Straup Cope
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the {organization} nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -34,11 +34,9 @@ w.render(source: source_url, completionHandler: on_complete)
 
 ## Notes
 
-Under the hood this package is using [NSPrintOperation](https://developer.apple.com/documentation/appkit/nsprintoperation) to render a `WebView`. Ideally I would like `NSPrintOperation` to print directly to a `Data` instance but it's unclear to me whether this is possible or how to do it.
+Prior to iOS 14 and MacOS 10.16 this package is uses [NSPrintOperation](https://developer.apple.com/documentation/appkit/nsprintoperation) to render a `WebView`. Ideally I would like `NSPrintOperation` to print directly to a `Data` instance but it's not possible to do this. Instead the `render` method creates a temporary file, writes to it, reads the data and removes the temporary file on exit. This introduces extra overhead but, hopefully, keeps the interface a little more agnostic about how the resultant PDF document is used.
 
-_Really what we want is to be able to pass the `NSPrintOperation` method something like an abstract "writer" similar to the Go languae [io.Writer](https://golang.org/pkg/io/) interface. I don't know whether this is even possible in Swift._
-
-Instead the `render` method creates a temporary file, writes to it, reads the data and removes the temporary file on exit. This introduces extra overhead but, hopefully, keeps the interface a little more agnostic about how the resultant PDF document is used.
+_Really what we want is to be able to pass the `NSPrintOperation` method something like an abstract "writer" similar to the Go language [io.Writer](https://golang.org/pkg/io/) interface but this is not possible in Swift. Perhaps in future releases the [WKWebView.createPDF](https://developer.apple.com/documentation/webkit/wkwebview/3650490-createpdf) method will adopt the publish/subscribe model used in Apple's [Combine](https://developer.apple.com/documentation/combine) framework but today it does not._
 
 ## Credits