doc update

generated from commit bbc9c12164

tutorial4.html

@@ -187,6 +187,22 @@ fn main() -> Result<(), Box<Error>> {
 # 
 # Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.
 # 
+# ## Features
+# 
+# `no-fileline`
+# : completely turn off storing filename and line
+# 
+# `display-cause`
+# : turn on printing a backtrace of the errors in `Display`
+# 
+# `no-debug-cause`
+# : turn off printing a backtrace of the errors in `Debug`
+# 
+# 
+# # Tutorial
+# 
+# Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)
+# 
 # # Examples
 # 
 # ~~~rust