chore(deps): fix typescript deps

Author: iguissouma

frontend/package.json

@@ -64,6 +64,6 @@
     "protractor": "5.4.1",
     "ts-node": "7.0.1",
     "tslint": "5.11.0",
-    "typescript": "3.2.2"
+    "typescript": "3.1.1"
   }
 }

server/pom.xml

@@ -22,6 +22,9 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<java.version>1.8</java.version>
+        <spqr.version>0.9.8</spqr.version>
+        <spqr-starter.version>0.0.2</spqr-starter.version>
+		<gson.version>2.6.2</gson.version>
 	</properties>
 
 	<dependencies>
@@ -60,17 +63,17 @@
 		<dependency>
 			<groupId>io.leangen.graphql</groupId>
 			<artifactId>spqr</artifactId>
-			<version>0.9.8</version>
+			<version>${spqr.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>io.leangen.graphql</groupId>
 			<artifactId>graphql-spqr-spring-boot-starter</artifactId>
-			<version>0.0.2</version>
+			<version>${spqr-starter.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>com.google.code.gson</groupId>
 			<artifactId>gson</artifactId>
-			<version>2.6.2</version>
+			<version>${gson.version}</version>
 		</dependency>
 	</dependencies>