Fix freeCompilerArgs definition in Gradle build

Closes gh-593

initializr-generator/src/main/resources/templates/starter-build.gradle

@@ -48,12 +48,16 @@ group = '{{groupId}}'
 version = '{{version}}'
 sourceCompatibility = {{javaVersion}}{{#kotlin}}
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]{{#java8OrLater}}
-	kotlinOptions.jvmTarget = "1.8"{{/java8OrLater}}
+		jvmTarget = "1.8"{{/java8OrLater}}
+	}
 }
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]{{#java8OrLater}}
-	kotlinOptions.jvmTarget = "1.8"{{/java8OrLater}}
+		jvmTarget = "1.8"{{/java8OrLater}}
+	}
 }{{/kotlin}}
 
 repositories {

initializr-generator/src/test/resources/project/gradle/kotlin-java6-build.gradle.gen

@@ -24,11 +24,15 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = 1.6
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
 	}
+}
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
 	}
+}
 
 repositories {
 	mavenCentral()

initializr-generator/src/test/resources/project/gradle/kotlin-java7-build.gradle.gen

@@ -24,11 +24,15 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = 1.7
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
 	}
+}
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
 	}
+}
 
 repositories {
 	mavenCentral()

initializr-generator/src/test/resources/project/gradle/kotlin-java9-build.gradle.gen

@@ -25,12 +25,16 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = 9
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 
 repositories {

initializr-generator/src/test/resources/project/gradle/kotlin-springboot2-build.gradle.gen

@@ -25,12 +25,16 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = 1.8
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 
 repositories {

initializr-generator/src/test/resources/project/gradle/kotlin-springboot2-legacy-build.gradle.gen

@@ -25,12 +25,16 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = 1.8
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 
 repositories {

initializr-generator/src/test/resources/project/kotlin/standard/build.gradle.gen

@@ -24,12 +24,16 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = 1.8
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 
 repositories {

initializr-generator/src/test/resources/project/kotlin/war/build.gradle.gen

@@ -25,12 +25,16 @@ group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 sourceCompatibility = 1.8
 compileKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 compileTestKotlin {
+	kotlinOptions {
 		freeCompilerArgs = ["-Xjsr305=strict"]
-	kotlinOptions.jvmTarget = "1.8"
+		jvmTarget = "1.8"
+	}
 }
 
 repositories {