Fix version. (#755)

Co-authored-by: Christian Legnitto <[email protected]>

Author: bostontrader

docs/book/content/quickstart.md

@@ -10,7 +10,7 @@ Juniper follows a [code-first approach][schema_approach] to defining GraphQL sch
 
 ```toml
 [dependencies]
-juniper = "0.14.2"
+juniper = { git = "https://github.com/graphql-rust/juniper" }
 ```
 
 ## Schema example