Fix Index link in en README.

alext · web-flow · commit 27be0a4d5b85 · 2016-10-14T16:03:31.000+01:00
It was pointing into an `eBook` directory that no longer looks to exist.
diff --git a/en/README.md b/en/README.md
@@ -38,4 +38,4 @@ the code is licensed under a [BSD 3-Clause License](<https://github.com/astaxie/
 
 ### Get Started
 
-[Index](./eBook/preface.md)
+[Index](./preface.md)

Original file line number	Diff line number	Diff line change
`@@ -38,4 +38,4 @@ the code is licensed under a [BSD 3-Clause License](<https://github.com/astaxie/`
`38`	`38`
`39`	`39`	`### Get Started`
`40`	`40`
`41`		`-[Index](./eBook/preface.md)`
	`41`	`+[Index](./preface.md)`