Be less restrictive about the GitBook version

SamyPesse · SamyPesse · commit 94cad985737d · 2016-04-11T10:30:26.000+02:00
diff --git a/book.json b/book.json
@@ -1,5 +1,5 @@
 {
-    "gitbook": "3.0.0-pre.5",
+    "gitbook": ">=3.0.0-pre.5",
     "links": {
         "sidebar": {
             "Need help? Talk to us!": "https://gitter.im/DjangoGirls/tutorial"

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,5 @@`
`1`	`1`	`{`
`2`		`- "gitbook": "3.0.0-pre.5",`
	`2`	`+ "gitbook": ">=3.0.0-pre.5",`
`3`	`3`	`"links": {`
`4`	`4`	`"sidebar": {`
`5`	`5`	`"Need help? Talk to us!": "https://gitter.im/DjangoGirls/tutorial"`