docs(context): document keys, errors, and accepted, close #488

context.go

@@ -49,8 +49,14 @@ type Context struct {
 	index    int8
 
 	engine *Engine
+
+	// Keys is a key/value pair exclusively for the context of each request
 	Keys map[string]interface{}
+
+	// Errors is a list of errors attached to all the handlers/middlewares who used this context
 	Errors errorMsgs
+
+	// Accepted defines a list of manually accepted formats for content negotiation
 	Accepted []string
 }