Fix introspection crash during tests

Author: Fred RAJAONA

.travis.yml

@@ -8,10 +8,10 @@ matrix:
   include:
     - os: osx
       env: JOB=SwiftPM_OSX
-      osx_image: xcode10.2
+      osx_image: xcode11
     - os: linux
       env: JOB=SwiftPM_linux
-      dist: trusty
+      dist: bionic
       sudo: required
       install:
         -  travis_retry eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)"

Sources/GraphQL/Type/Introspection.swift

@@ -229,7 +229,7 @@ let __Type: GraphQLObjectType = try! GraphQLObjectType(
                     let fieldMap = type.fields
                     var fields = Array(fieldMap.values).sorted(by: { $0.name < $1.name })
 
-                    if !arguments["includeDeprecated"].bool! {
+                    if !(arguments["includeDeprecated"].bool ?? false) {
                         fields = fields.filter({ !$0.isDeprecated })
                     }
 
@@ -240,7 +240,7 @@ let __Type: GraphQLObjectType = try! GraphQLObjectType(
                     let fieldMap = type.fields
                     var fields = Array(fieldMap.values).sorted(by: { $0.name < $1.name })
 
-                    if !arguments["includeDeprecated"].bool! {
+                    if !(arguments["includeDeprecated"].bool ?? false) {
                         fields = fields.filter({ !$0.isDeprecated })
                     }
 
@@ -285,7 +285,7 @@ let __Type: GraphQLObjectType = try! GraphQLObjectType(
 
                 var values = type.values
 
-                if !arguments["includeDeprecated"].bool! {
+                if !(arguments["includeDeprecated"].bool ?? false) {
                     values = values.filter({ !$0.isDeprecated })
                 }