Update versions referenced in server integration docs (#1013)

Author: DigitalZebra

docs/book/content/servers/hyper.md

@@ -16,8 +16,8 @@ Juniper's Hyper integration is contained in the [`juniper_hyper`][juniper_hyper]
 
 ```toml
 [dependencies]
-juniper = "0.10"
-juniper_hyper = "0.1.0"
+juniper = "0.15.7"
+juniper_hyper = "0.8.0"
 ```
 
 Included in the source is a [small example][example] which sets up a basic GraphQL and [GraphiQL] handler.

docs/book/content/servers/iron.md

@@ -11,8 +11,8 @@ Juniper's Iron integration is contained in the `juniper_iron` crate:
 
 ```toml
 [dependencies]
-juniper = "0.10"
-juniper_iron = "0.2.0"
+juniper = "0.15.7"
+juniper_iron = "0.7.4"
 ```
 
 Included in the source is a [small

docs/book/content/servers/rocket.md

@@ -10,8 +10,8 @@ Juniper's Rocket integration is contained in the [`juniper_rocket`][juniper_rock
 
 ```toml
 [dependencies]
-juniper = "0.10"
-juniper_rocket = "0.2.0"
+juniper = "0.15.7"
+juniper_rocket = "0.8.0"
 ```
 
 Included in the source is a [small example][example] which sets up a basic GraphQL and [GraphiQL] handler.

docs/book/content/servers/warp.md

@@ -10,8 +10,8 @@ Juniper's Warp integration is contained in the [`juniper_warp`][juniper_warp] cr
 
 ```toml
 [dependencies]
-juniper = "0.10"
-juniper_warp = "0.1.0"
+juniper = "0.15.7"
+juniper_warp = "0.7.0"
 ```
 
 Included in the source is a [small example][example] which sets up a basic GraphQL and [GraphiQL] handler.