Add integration tests to release automation

We want their version bumped when juniper is released as
well.

Author: LegNeato

integration_tests/juniper_2018_edition_tests/Cargo.toml

@@ -3,6 +3,7 @@ name = "juniper_2018_edition_tests"
 version = "0.1.0"
 authors = ["Christoph Herzog <[email protected]>"]
 edition = "2018"
+publish = false
 
 [dependencies]
 juniper = { version = "0.11", path = "../../juniper" }

juniper/release.toml

@@ -5,6 +5,7 @@ tag-message = "Release {{crate_name}} {{version}}"
 upload-doc = false
 pre-release-replacements = [
   {file="CHANGELOG.md", search="# master", replace="# master\n\n- No changes yet\n\n# [[{{version}}] {{date}}](https://github.com/graphql-rust/juniper/releases/tag/{{crate_name}}-{{version}})"},
+  {file="../integration_tests/juniper_tests/Cargo.toml", search="juniper = { version = \"0.11.0\"", replace="juniper = { version = \"{{version}}\""},
   {file="../juniper_hyper/Cargo.toml", search="juniper = { version = \"0.11.0\"", replace="juniper = { version = \"{{version}}\""},
   {file="../juniper_iron/Cargo.toml", search="juniper = { version = \"0.11.0\"", replace="juniper = { version = \"{{version}}\""},
   {file="../juniper_rocket/Cargo.toml", search="juniper = { version = \"0.11.0\"", replace="juniper = { version = \"{{version}}\""},