Implementation of https://github.com/kataras/iris/issues/412 , as requested. Read HISTORY for a code snippet

HISTORY.md

@@ -2,6 +2,33 @@
 
 **How to upgrade**: remove your `$GOPATH/src/github.com/kataras` folder, open your command-line and execute this command: `go get -u github.com/kataras/iris/iris`.
 
+## 4.4.0 -> 4.4.1
+
+- **NEW**: Template PreRenders, as requested [here](https://github.com/kataras/iris/issues/412).
+
+```go
+// ...
+	iris.UsePreRender(func(ctx *iris.Context, filename string, binding interface{}, options ...map[string]interface{}) bool {
+		// put the 'Error' binding here, for the shake of the test
+		if b, isMap := binding.(map[string]interface{}); isMap {
+			b["Error"] = "error!"
+		}
+		// true= continue to the next PreRender
+    // false= do not continue to the next PreRender
+    // * but the actual Render will be called at any case *
+		return true
+	})
+
+  iris.Get("/", func(ctx *Context) {
+  		ctx.Render("hi.html", map[string]interface{}{"Username": "anybody"})
+      // hi.html: <h1>HI {{.Username}}. Error: {{.Error}}</h1>
+  })
+
+// ...
+```
+
+
+
 ## 4.3.0 -> 4.4.0
 
 **NOTE**: For normal users this update offers nothing, read that only if you run Iris behind a proxy or balancer like `nginx` or you need to serve using a custom `net.Listener`.