min java version 8, version changed to 3.1.0

Author: Valentin Popov

pom.xml

@@ -1,36 +1,41 @@
 <project>
-	<!-- 
-		This package file is a place holder to enable the dependency graph https://github.com/microsoftgraph/msgraph-sdk-java/network/dependencies
-		as the dependency graph is not compatible with gradle https://docs.github.com/en/free-pro-team@latest/github/visualizing-repository-data-with-graphs/about-the-dependency-graph#supported-package-ecosystems
-		build.gradle is the source of truth
-	-->
-	<modelVersion>4.0.0</modelVersion>
-   
-	<groupId>com.microsoft.graph</groupId>
-	<artifactId>microsoft-graph</artifactId>
-	<version>3.0.0</version>
-	<packaging>pom</packaging>
+    <!--
+        This package file is a place holder to enable the dependency graph https://github.com/microsoftgraph/msgraph-sdk-java/network/dependencies
+        as the dependency graph is not compatible with gradle https://docs.github.com/en/free-pro-team@latest/github/visualizing-repository-data-with-graphs/about-the-dependency-graph#supported-package-ecosystems
+        build.gradle is the source of truth
+    -->
+    <modelVersion>4.0.0</modelVersion>
 
-	<dependencies>
-		<dependency>
-			<groupId>com.google.guava</groupId>
-			<artifactId>guava</artifactId>
-			<version>30.1-jre</version>
-		</dependency>
-		<dependency>
-			<groupId>com.google.code.gson</groupId>
-			<artifactId>gson</artifactId>
-			<version>2.8.6</version>
-		</dependency>
-		<dependency>
-			<groupId>com.squareup.okhttp3</groupId>
-			<artifactId>okhttp</artifactId>
-			<version>4.9.1</version>
-		</dependency>
-		<dependency>
-			<groupId>com.microsoft.graph</groupId>
-			<artifactId>microsoft-graph-core</artifactId>
-			<version>2.0.0</version>
-		</dependency>
-	</dependencies>
+    <groupId>com.microsoft.graph</groupId>
+    <artifactId>microsoft-graph</artifactId>
+    <version>3.1.0</version>
+    <packaging>pom</packaging>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>30.1-jre</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.6</version>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>4.9.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.microsoft.graph</groupId>
+            <artifactId>microsoft-graph-core</artifactId>
+            <version>2.0.0</version>
+        </dependency>
+    </dependencies>
 </project>